The speed of a boat in still water is 14 km/h and the speed of the current is 4 km/h. How much time will the boat take to cover a distance of 72 km downstream? MCQ with Answer and Explanation
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Question #1
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A scooter travels from town P to town Q at 30 km/h and returns at 45 km/h. Find the net average speed for the round journey.
Correct Answer: Option C
Explanation:
Average Speed = 2xy / (x + y) = (2 * 30 * 45) / (30 + 45) = 2700 / 75 = 36 km/h.
Average Speed = 2xy / (x + y) = (2 * 30 * 45) / (30 + 45) = 2700 / 75 = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 180 meters long is running at a speed of 90 km/h. How long will it take to pass a post?
Correct Answer: Option A
Explanation:
Speed = 90 * (5/18) = 25 m/s. Time to pass a post = 180 / 25 = 7.2 seconds.
Speed = 90 * (5/18) = 25 m/s. Time to pass a post = 180 / 25 = 7.2 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boatman can row 16 km/h in still water. If the river velocity index tracks at 4 km/h, find the time interval required by the boat hull to row 48 km upstream.
Correct Answer: Option C
Explanation:
Upstream tracking speed = 16 - 4 = 12 km/h. Time required = Sector Distance / Upstream Speed = 48 / 12 = 4 hours.
Upstream tracking speed = 16 - 4 = 12 km/h. Time required = Sector Distance / Upstream Speed = 48 / 12 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
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