A motorboat rows 24 km downstream in 3 hours and tracks the identical route upstream back to the jetty point in 4 hours. Find the net speed index of the current stream flow. MCQ with Answer and Explanation
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Question #1
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A train 140 meters long tracking at 63 km/h passes a modern bridge in 24 seconds. Find the length of the bridge.
Correct Answer: Option D
Explanation:
Speed of train = 63 * (5/18) = 17.5 m/s. Total distance handled in 24 seconds = 17.5 * 24 = 420 meters. Length of the bridge = 420 - 140 = 280 meters.
Speed of train = 63 * (5/18) = 17.5 m/s. Total distance handled in 24 seconds = 17.5 * 24 = 420 meters. Length of the bridge = 420 - 140 = 280 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boatman rows 24 km downstream and 12 km upstream, taking 2 hours for each leg of the journey. Find the speed of the boat in still water.
Correct Answer: Option C
Explanation:
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 12 / 2 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 12 / 2 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A track sprinter matches a 300-meter straight heat in 30 seconds. Find his moving speed in km/h.
Correct Answer: Option D
Explanation:
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
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