A motorist covers a distance of 180 km at 45 km/h and returns at 60 km/h. Find the total time spent for the entire round trip. MCQ with Answer and Explanation

Question

A motorist covers a distance of 180 km at 45 km/h and returns at 60 km/h. Find the total time spent for the entire round trip.

A. 9 hours

B. 6 hours

C. 8 hours

D. 7 hours

Answer: Option D

Solution (By JKSSB Mock Tests)

Time for outward journey = 180 / 45 = 4 hours. Time for return journey = 180 / 60 = 3 hours. Total time = 4 + 3 = 7 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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The ratio of speeds of a car, a train and a bus is 5 : 9 : 4. The average speed of the car, the train and the bus together is 60 km/h. What is the average speed of the car and the bus together?

A. 60 km/h

B. 54 km/h

C. 45 km/h

D. 50 km/h

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Correct Answer: Option C

Explanation:
Let the speeds be 5x, 9x, and 4x. Average speed of all three = (5x + 9x + 4x) / 3 = 18x / 3 = 6x = 60 km/h => x = 10. Speed of car = 50 km/h, speed of bus = 40 km/h. Average speed of car and bus = (50 + 40) / 2 = 45 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train passes a standing man in 6 seconds and a 210-meter long platform in 16 seconds. Find the speed of the train.

A. 75.6 km/h

B. 54 km/h

C. 72 km/h

D. 80 km/h

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Correct Answer: Option A

Explanation:
Let length of train be L. Speed = L/6. Also, Speed = (L + 210)/16. Equating them: L/6 = (L+210)/16 => 16L = 6L + 1260 => 10L = 1260 => L = 126 meters. Speed = 126 / 6 = 21 m/s. Speed in km/h = 21 * (18/5) = 378 / 5 = 75.6 km/h.

This question belongs to: Maths Time Speed and Distance