A boat can row 12 km/h in still water. If the river current flows at 3 km/h, find the time taken to row 45 km downstream. MCQ with Answer and Explanation
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Question #1
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A boat can row 10 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 24 km upstream.
Correct Answer: Option D
Explanation:
Upstream speed = 10 - 2 = 8 km/h. Time taken = 24 / 8 = 3 hours.
Upstream speed = 10 - 2 = 8 km/h. Time taken = 24 / 8 = 3 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Two trains 150 meters and 100 meters long are running along parallel tracks in the same direction at speeds of 56 km/h and 46 km/h respectively. In what time will the faster train cross the slower train completely?
Correct Answer: Option D
Explanation:
Total distance = 150 + 100 = 250 meters. Relative speed in same direction = 56 - 46 = 10 km/h = 10 * (5/18) = 25/9 m/s. Time required = 250 / (25/9) = 250 * 9 / 25 = 90 seconds.
Total distance = 150 + 100 = 250 meters. Relative speed in same direction = 56 - 46 = 10 km/h = 10 * (5/18) = 25/9 m/s. Time required = 250 / (25/9) = 250 * 9 / 25 = 90 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 140 meters long passes a platform 160 meters long in 15 seconds. Find the speed of the train in km/h.
Correct Answer: Option B
Explanation:
Total distance = 140 + 160 = 300 meters. Speed = 300 / 15 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
Total distance = 140 + 160 = 300 meters. Speed = 300 / 15 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
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