A passenger express train 160 meters long runs at 72 km/h. How long will it take to clear a terminal platform 240 meters long? MCQ with Answer and Explanation
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Question #1
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A person row a boat 30 km downstream in 3 hours and returns upstream in 5 hours. Find the speed of the current.
Correct Answer: Option C
Explanation:
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 5 = 6 km/h. Speed of current = (10 - 6) / 2 = 2 km/h.
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 5 = 6 km/h. Speed of current = (10 - 6) / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person walks from his house to his office at a speed of 4 km/h and reaches 10 minutes late. If he walks at 5 km/h, he reaches 5 minutes early. Find the distance between his house and office.
Correct Answer: Option D
Explanation:
Time difference = 10 - (-5) = 15 minutes = 1/4 hour. Let distance be d. d/4 - d/5 = 1/4 => d/20 = 1/4 => d = 5 km.
Time difference = 10 - (-5) = 15 minutes = 1/4 hour. Let distance be d. d/4 - d/5 = 1/4 => d/20 = 1/4 => d = 5 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person covers a distance of 60 km at 15 km/h and another 40 km at 20 km/h. Find his average speed for the full journey.
Correct Answer: Option A
Explanation:
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.
This question belongs to:
Maths
Time Speed and Distance
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