Two cities A and B are 360 km apart. A car goes from A to B at 40 km/h and returns to A at 60 km/h. Find the average speed of the car. MCQ with Answer and Explanation

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Two cities A and B are 360 km apart. A car goes from A to B at 40 km/h and returns to A at 60 km/h. Find the average speed of the car.

A. 48 km/h

B. 52 km/h

C. 50 km/h

D. 55 km/h

Answer: Option A

Solution (By JKExamLibrary)

Average speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.

This question belongs to: Maths Time Speed and Distance

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Practice More Time Speed and Distance Questions

Question #1 Report Error

A man rows a boat 18 km in 4 hours downstream and returns upstream in 12 hours. Find the speed of the stream.

A. 1.5 km/h

B. 2.5 km/h

C. 1 km/h

D. 2 km/h

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Downstream speed = 18 / 4 = 4.5 km/h. Upstream speed = 18 / 12 = 1.5 km/h. Speed of stream = (4.5 - 1.5) / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2 Report Error

A person has to cover a distance of 160 km. He covers the first half of the distance at 40 km/h. At what speed must he travel the remaining half to make the average speed for the whole journey 50 km/h?

A. 60 km/h

B. 70 km/h

C. 66.67 km/h

D. 75 km/h

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Let the required speed for the second half be x km/h. Using the average speed formula for equal halves: Average Speed = 2v1*v2 / (v1 + v2) => 50 = (2 * 40 * x) / (40 + x) => 50(40 + x) = 80x => 2000 + 50x = 80x => 30x = 2000 => x = 66.67 km/h.

This question belongs to: Maths Time Speed and Distance