Question

Please tell the right answer​

Answer 1

To find :

the distance travelled by the car in those 20 min

Given :

• speed for first 10 min = 20 km/h
• speed for another 10 min = 40 km/h

Average speed of car :

as the car travelled for the same time with both speed.

hence, Average speed

= 20+40/2

= 30 km/h

Formula to be applied:

• distance = speed × time

Solution :

20 min = 1/3 hours

hence, distance = 30 × 1/3

so, distance = 10 km

the car travelled 10 km

Answer 2

Answer:

Required Question :

A bus movea with a speed of 20km/h for 10 min and then with a speed 40km/h for next 10 min. Calculate the total distance covered by the bus.

$\begin{gathered}\end{gathered}$

Given :

• ➝ Speed of bus 20km/h for 10 min.
• ➝ Speed of bus 40km/h for 10 min.

$\begin{gathered}\end{gathered}$

To Find :

• ➝ Total distance covered by the bus.

$\begin{gathered}\end{gathered}$

Using Formulas :

${\longrightarrow{\underline{\boxed{\sf{Distance = Speed \times Time}}}}}$

${\longrightarrow{\underline{\boxed{\sf{Total \: distance = d_{1} + d_{2}}}}}}$

$\begin{gathered}\end{gathered}$

Solution :

Case 1 :-

Finding the distance covered by bus at speed of 20km/h for 10 min. But before finding the distance, we need to convert the time in hour.

• 1 min = 1/60 hour

So, converting the 10 min into hour.

${\longrightarrow{\sf{Time = 10 \: min}}}$

${\longrightarrow{\sf{Time = \dfrac{10}{60}}}}$

${\longrightarrow{\sf{Time = \cancel{\dfrac{10}{60}}}}}$

${\longrightarrow{\sf{Time = \dfrac{1}{6} \: hour}}}$

• Hence, the time is 1/6 hour.

Now, finding the distance.

${\longrightarrow{\sf{Distance = Speed \times Time}}}$

${\longrightarrow{\sf{Distance = 20 \times \dfrac{1}{6}}}}$

${\longrightarrow{\sf{Distance = \dfrac{20}{6}}}}$

${\longrightarrow{\sf{Distance = \cancel{\dfrac{20}{6}}}}}$

${\longrightarrow{\sf{Distance = \dfrac{10}{3} \: km}}}$

$\bigstar \: {\red{\underline{\boxed{\sf{Distance = \dfrac{10}{3} \: km}}}}}$

• Hence, the distance covered by bus in 10 min is 10/3 km.

$\rule{300}{1.5}$

Case 2 :-

Finding the distance covered by bus at speed of 40km/h for 10 min. But before finding the distance, we need to convert the time in hour.

• 1 min = 1/60 hour

So, converting the 10 min into hour.

${\longrightarrow{\sf{Time = 10 \: min}}}$

${\longrightarrow{\sf{Time = \dfrac{10}{60}}}}$

${\longrightarrow{\sf{Time = \cancel{\dfrac{10}{60}}}}}$

${\longrightarrow{\sf{Time = \dfrac{1}{6} \: hour}}}$

• Hence, the time is 1/6 hour.

Now, finding the distance.

${\longrightarrow{\sf{Distance = Speed \times Time}}}$

${\longrightarrow{\sf{Distance = 40 \times \dfrac{1}{6}}}}$

${\longrightarrow{\sf{Distance = \dfrac{40}{6}}}}$

${\longrightarrow{\sf{Distance = \cancel{\dfrac{40}{6}}}}}$

${\longrightarrow{\sf{Distance = \dfrac{20}{3} \: km}}}$

$\bigstar \: {\red{\underline{\boxed{\sf{Distance = \dfrac{20}{3} \: km}}}}}$

• Hence, the distance covered by bus in 10 min is 20/3 km.

$\rule{300}{1.5}$

Now, finding the total distance covered by bus :-

${\longrightarrow{\sf{Total \: distance = d_{1} + d_{2}}}}$

${\longrightarrow{\sf{Total \: distance = \dfrac{10}{3} + \dfrac{20}{3}}}}$

${\longrightarrow{\sf{Total \: distance = \dfrac{10 + 20}{3}}}}$

${\longrightarrow{\sf{Total \: distance = \dfrac{30}{3}}}}$

${\longrightarrow{\sf{Total \: distance = \cancel{\dfrac{30}{3}}}}}$

${\longrightarrow{\sf{Total \: distance = 10 \: km}}}$

$\bigstar\:{\red{\underline{\boxed{\sf{Total \: distance = 10 \: km}}}}}$

• Hence, the total distance covered by the bus is 10 km.

$\begin{gathered}\end{gathered}$

Learn More :

Formulas :

$\longrightarrow{\small{\underline{\boxed{\sf{Distance = Speed \times time}}}}}$

$\longrightarrow{\small{\underline{\boxed{\sf{Time = \dfrac{Distance}{Speed}}}}}}$

$\longrightarrow{\small{\underline{\boxed{\sf{Speed = \dfrac{Distance}{Time}}}}}}$

Units :

$\dashrightarrow{\sf{Time = Seconds, minutes, hours}}$

$\dashrightarrow{\sf{Distance = meter, kilometer}}$

$\dashrightarrow{\sf{Speed = km/ hr, m /sec}}$

$\begin{gathered}\end{gathered}$

Note :

• You can solve this question by second method also. which is already answer by @YourHelperAdi.
• Here's the question link : https://brainly.in/question/46940903

$\rule{220pt}{3.5pt}$