A car covers a distance of 180 km at 45 km/h and another 180 km at 60 km/h. Find the total time spent during the journey. MCQ with Answer and Explanation

Question

A car covers a distance of 180 km at 45 km/h and another 180 km at 60 km/h. Find the total time spent during the journey.

A. 7.0 hours

B. 8.0 hours

C. 7.5 hours

D. 6.5 hours

Answer: Option A

Solution (By JKSSB Mock Tests)

Time for first part = 180 / 45 = 4 hours. Time for second part = 180 / 60 = 3 hours. Total time taken = 4 + 3 = 7 hours.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train starts from Delhi at 6:00 AM and reaches Ambala at 10:00 AM. Another train starts from Ambala at 8:00 AM and reaches Delhi at 11:30 AM. At what time do the two trains cross each other?

A. 8:56 AM

B. 9:36 AM

C. 9:24 AM

D. 9:12 AM

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Correct Answer: Option A

Explanation:
Train 1 takes 4 hours, Train 2 takes 3.5 hours (7/2 hours). Let distance be LCM(4, 3.5) = 28 units. Speed of Train 1 = 7 units/h, Speed of Train 2 = 8 units/h. By 8:00 AM, Train 1 travels 2 hours * 7 = 14 units. Remaining distance = 28 - 14 = 14 units. Relative speed = 7 + 8 = 15 units/h. Time to meet after 8 AM = 14/15 hours = 56 minutes. Meeting time = 8:56 AM.

This question belongs to: Maths Time Speed and Distance

Question #2

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Excluding stoppages, the speed of an inter-city bus is 45 km/h and including stoppages it is 36 km/h. How many minutes does the bus stop per hour?

A. 12 minutes

B. 18 minutes

C. 10 minutes

D. 15 minutes

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Correct Answer: Option A

Explanation:
Stoppage time per hour = (45 - 36) / 45 = 9 / 45 = 1/5 hour. In minutes = (1/5) * 60 = 12 minutes.

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Question #3

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A crew row a boat 24 km upstream and 36 km downstream, taking 4 hours for each separate direction. Find the speed of the current stream.

A. 2 km/h

B. 1.75 km/h

C. 1.25 km/h

D. 1.5 km/h

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Correct Answer: Option D

Explanation:
Upstream speed = 24 / 4 = 6 km/h. Downstream speed = 36 / 4 = 9 km/h. Current speed = (Downstream speed - Upstream speed) / 2 = (9 - 6) / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance

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