Two trains 100 meters and 150 meters long are running in opposite directions at speeds of 40 km/h and 50 km/h respectively. In what time will they cross each other? MCQ with Answer and Explanation
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Question #1
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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.
Correct Answer: Option C
Explanation:
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed of current stream flow = (16 - 8) / 2 = 8 / 2 = 4 km/h.
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed of current stream flow = (16 - 8) / 2 = 8 / 2 = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A cargo truck covers the first 4 hours of its route at 60 km/h and the remaining 3 hours at 70 km/h. Find the net average speed.
Correct Answer: Option A
Explanation:
Distance 1 = 60 * 4 = 240 km. Distance 2 = 70 * 3 = 210 km. Total distance = 240 + 210 = 450 km. Total time = 4 + 3 = 7 hours. Average speed = 450 / 7 = 64.28 km/h.
Distance 1 = 60 * 4 = 240 km. Distance 2 = 70 * 3 = 210 km. Total distance = 240 + 210 = 450 km. Total time = 4 + 3 = 7 hours. Average speed = 450 / 7 = 64.28 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train crosses a bridge of length 150 meters in 15 seconds and a pole in 9 seconds. What is the length of the train?
Correct Answer: Option B
Explanation:
Let train length be L. Speed = L / 9. Also, Speed = (L + 150) / 15. So, L / 9 = (L + 150) / 15 => 15L = 9L + 1350 => 6L = 1350 => L = 225 meters.
Let train length be L. Speed = L / 9. Also, Speed = (L + 150) / 15. So, L / 9 = (L + 150) / 15 => 15L = 9L + 1350 => 6L = 1350 => L = 225 meters.
This question belongs to:
Maths
Time Speed and Distance
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