Question

A car travels with 40kmph for first 3km and with 60kmph for next 3km distance. Find its
average speed?

Answer 1

Answer:

48 kmph

Explanation:

       Using:   Time = distance/speed

Case 1: car travels with 40 kmph for first 3km.  

          Time = 3/40 hr

                   

Case 2: car travels with 60 kmph for first 3km.  

          Time = 3/60 hr  = 1/20 hr

 From both the cases,

          total time = 3/40 + 1/20

                           = 1/8

       total distance = 3 + 3 km

                               = 6 km

∴ Average speed = distance/time

                     = 6/(1/8)  kmph

                     = 48 kmph        

Answer 2

Answer:

$\sf\tt\large{\green {\underline {\underline{⚘\;Question:}}}}$

1. A car travells with 40 kmph for first 3km and with 60kmph for next 3km distance. Find its average speed.

$\sf\tt\large{\green {\underline {\underline{⚘\;Answer:}}}}$

$\sf\tt\large{\purple {\underline {\underline{⚘\;The \;average \:speed \;is \;48 kmph:}}}}$

$\sf\tt\large{\red {\underline {\underline{⚘\;Given:}}}}$

A car travells with 40 kmph for next 3km and with 60 kmph for next 3km distance.

$\sf\tt\large{\red {\underline {\underline{⚘\;To find:}}}}$

• The average speed.

$\sf\tt\large{\red {\underline {\underline{⚘\;Solution:}}}}$

• First lets verify your questions and next enter to calculations.

In the question given that the A car travells with 40kmph for next 3km and with 60kmph for next 3km distance. And here we should find average speed by the car .

$\sf\tt\large{\red {\underline {\underline{⚘\;Case(i):}}}}$

In the question given that the car travels with 40kmph for next 3km .

•we can wtite it as ,

$\sf\tt\large{\blue {\underline {\underline{\;Time =3/40 hours:}}}}$

$\sf\tt\large{\red {\underline {\underline{⚘\;Case (ii):}}}}$

In the question given that the car travels with 60 kmph for next 3km distance.

we can write it as ,

$\sf\tt\large{\blue {\underline {\underline{\;Time= 3/60 hours:}}}}$

Now ,

Lets add these two cases first and next we can calculate the average speed of the car.

• Lets add the cases now,
• Here the total time of both of cases is ,

• Total time =3/40+3/60= 1/8 s

• Next;

Here we should add the given distance values to get total distance value So, we get

• T.distance=3+3=6km.

Now ,

• Here we know the formula to find average speed that is ,

$\sf\tt\large{\blue {\underline {\underline{\;Average \: speed\;= \;total \;distance/ total time:}}}}$

• Now ,lets apply the values

• Average speed of car =6/(1/18)=48kmph.

$\sf\tt\large{\red {\underline {\underline{⚘\;Hope \;it \;helps \;you:}}}}$

$\sf\tt\large{\red {\underline {\underline{⚘\;Thank \;you:}}}}$