A man covers a certain distance by car driving at 40 km/h and returns back to the starting point riding on a scooter at 10 km/h. Find his average speed for the whole journey. MCQ with Answer and Explanation
A man covers a certain distance by car driving at 40 km/h and returns back to the starting point riding on a scooter at 10 km/h. Find his average speed for the whole journey.
A. 16 km/h
B. 20 km/h
C. 25 km/h
D. 30 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
When equal distances are covered at two different speeds x and y, Average Speed = 2xy / (x + y). Here, Average Speed = (2 * 40 * 10) / (40 + 10) = 800 / 50 = 16 km/h.
The speed of a train is 25% more than the speed of a car. Both start from city P at the same time and reach city Q, 150 km away, at the same time. On the way, the train stops for 15 minutes at various stations. What is the speed of the car?
No comments yet. Be the first to start the discussion!