Question

A car is running at a speed of 60 km / h takes 4hours to complete the journey . How much will it take to complete same journey , if its speed is 48km / hr ​

Answer 1

Question :-

A car is running at a speed of 60 km / h takes 4 hours to complete the journey. How much time will it take to complete same journey , if its speed is 48km/hr ​?

Answer :-

5 hours

Given :-

A car is running at a speed of 60 km/h takes 4 hours to complete the journey.

To find :-

Time taken to complete same journey, if its speed is 48km/hr

Solution :-

•   A car is running at a speed of 60 km/hr takes 4 hours to complete the journey.

              Speed = 60 km/hr

       time taken = 4 hours

         Let's find the distance travelled

Let the distance travelled  be "x"

We know,

    $\boxed{\bf Speed=\frac{distance \ travelled}{time \ taken}}$

        60 km/hr = x/4 hours

          x = 60 × 4

          x = 240 km

⇒ Distance travelled = 240 km

•    How much time will it take to complete same journey, if its speed is 48km / hr ?

                     Speed = 48 km/hr

  Distance travelled = 240 km

We have to find time taken to complete the journey.

      $\boxed{\bf Speed=\frac{Distance \ travelled}{time \ taken}}$

         48 km/hr = 240 km/ time taken

          time taken = 240/48

         time taken = 10/2

        time taken = 5 hours

∴ Time taken to complete the journey if the speed is 48 km/hr = 5 hours

Answer 2

Answer:

$\bigstar{\bold{Time\:taken=5\:hours}}$

Step-by-step explanation:

$\Large{\underline{\sf{Given:}}}$

• Speed = 60 km/hr
• Time taken = 4 hours

$\Large{\underline{\sf{To\:Find:}}}$

• Time taken to complete the journey if the speed is 48 km/hr

$\Large{\underline{\sf{Concept:}}}$

First find the distance travelled by the car using the formula. Then substitute the value of distance in the formula to get time to find its value.

$\Large{\underline{\sf{Solution:}}}$

⇝ First we have to find the distance covered by the car.

⇝ We know that,

     Distance = Speed × Time

⇝ Substitute the data,

    Distance = 60 × 4

    Distance = 240 km

⇝ Hence distance travelled by the car is 240 km.

⇝ Now we have to find the time taken by the car if speed was 48 km/hr

⇝ We know that,

    Time = Distance/Speed

⇝ Substitute the data,

     Time = 240/48

      Time = 5 hours

⇝ Hence the time taken by the car is 5 hours.

    $\boxed{\bold{Time\:taken=5\:hours}}$

$\Large{\underline{\sf{Notes:}}}$

⇝ Speed = Distance/Time

⇝ Time = Distance/Speed

⇝ Distance = Speed × Time