A boat crew rows 32 km downstream in 2 hours and handles 16 km upstream in 2 hours flat. Find the speed index of the stream current flow. MCQ with Answer and Explanation
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Question #1
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A car runs at 50 km/h for 3 hours and then tracks at 70 km/h for the next 2 hours. Find the average speed across the whole route.
Correct Answer: Option D
Explanation:
Distance 1 = 50 * 3 = 150 km. Distance 2 = 70 * 2 = 140 km. Total distance = 290 km. Total time = 5 hours. Average speed = 290 / 5 = 58 km/h.
Distance 1 = 50 * 3 = 150 km. Distance 2 = 70 * 2 = 140 km. Total distance = 290 km. Total time = 5 hours. Average speed = 290 / 5 = 58 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A drone flies at 25 m/s. Find its speed in km/h.
Correct Answer: Option A
Explanation:
To convert m/s to km/h, multiply by 18/5. Speed = 25 * (18/5) = 90 km/h.
To convert m/s to km/h, multiply by 18/5. Speed = 25 * (18/5) = 90 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 110 meters long is traveling at 60 km/h. How much time will it take to pass a platform 240 meters long?
Correct Answer: Option B
Explanation:
Total distance = 110 + 240 = 350 meters. Speed = 60 * (5/18) = 50/3 m/s. Time = 350 / (50/3) = 350 * 3 / 50 = 7 * 3 = 21 seconds.
Total distance = 110 + 240 = 350 meters. Speed = 60 * (5/18) = 50/3 m/s. Time = 350 / (50/3) = 350 * 3 / 50 = 7 * 3 = 21 seconds.
This question belongs to:
Maths
Time Speed and Distance
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