A train 100 meters long running at 90 km/h crosses another train 150 meters long running at 54 km/h in the same direction. How much time do they take to cross each other? MCQ with Answer and Explanation
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Question #1
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A person covers a distance of 120 km at 30 km/h and another 180 km at 45 km/h. Find his average speed for the whole journey.
Correct Answer: Option C
Explanation:
Total distance = 120 + 180 = 300 km. Total time taken = 120/30 + 180/45 = 4 + 4 = 8 hours. Average speed = 300 / 8 = 37.5 km/h.
Total distance = 120 + 180 = 300 km. Total time taken = 120/30 + 180/45 = 4 + 4 = 8 hours. Average speed = 300 / 8 = 37.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train passes a 150-meter long bridge in 15 seconds and a standard sign post in 9 seconds. Find the length of the train.
Correct Answer: Option A
Explanation:
Time taken to cross the bridge alone = 15 - 9 = 6 seconds. Speed of train = 150 / 6 = 25 m/s. Length of train = Speed * Time to cross sign post = 25 * 9 = 225 meters.
Time taken to cross the bridge alone = 15 - 9 = 6 seconds. Speed of train = 150 / 6 = 25 m/s. Length of train = Speed * Time to cross sign post = 25 * 9 = 225 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A motorboat registers a speed of 15 km/h in still water. It takes 4 hours to cover a certain distance upstream. If the stream velocity is 3 km/h, find the distance covered.
Correct Answer: Option C
Explanation:
Upstream speed = 15 - 3 = 12 km/h. Distance = Upstream speed * Time = 12 * 4 = 48 km.
Upstream speed = 15 - 3 = 12 km/h. Distance = Upstream speed * Time = 12 * 4 = 48 km.
This question belongs to:
Maths
Time Speed and Distance
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