Question

A car travels from point A to B in 3 hours and returns back to point A in 5 hours. Point A and B are 150 km apart
along a straight highway. What is the average speed of the car in this journey?

18.75 km/hr
37.5 km/hr
30 km/hr
50 km/hr​

Answer 1

Answer:

18.75 km/hr

Explanation:

average speed = distance travelled / time taken

= 150/8 hr

= 18.75 km/hr

Answer 2

The average speed of the car on this journey is 37.5 km/h.

Among the given options option (b) 37.5 km/h is correct.

Here, it is given that a car travels from point A to B in 3 hours and returns back to point A in 5 hours. Points A and B are 150 km apart along a straight highway.

In this question, we have to find the average speed of the car on this journey.

Formula used: Average speed = Total distance/Total time taken

Calculation :

Step 1: Write the given values:

The distance between A and B = 150 km

Time taken from point A to B = 3 hours and Time taken from point B to point A = 5 hours.

Total distance covered in going from point A to B and in coming back from point B to point A = (150 km + 150 km) = 300 km

Total time is taken from point A to B and from point B to point A = (3 hrs + 5 hrs) = 8 hrs

Step 2: Put the above-given values in the formula and simplify:

Average speed = Total distance/Total time taken

Average speed = 300/8

Average speed = 75/2 km/h

Average speed = 37.5 km/h

Hence, the average speed of the car in this journey is 37.5 km/h. So option (b) 37.5 km/h is correct.

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