The speed of a train is 90 km/h. How many meters does it cross in exactly 12 seconds? MCQ with Answer and Explanation
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Question #1
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Two express trains 200 meters and 150 meters long are moving in the same direction at 72 km/h and 54 km/h respectively. Find the time taken by the faster train to cross the slower train completely.
Correct Answer: Option B
Explanation:
Total distance = 200 + 150 = 350 meters. Relative speed in same direction = 72 - 54 = 18 km/h = 5 m/s. Time taken = 350 / 5 = 70 seconds.
Total distance = 200 + 150 = 350 meters. Relative speed in same direction = 72 - 54 = 18 km/h = 5 m/s. Time taken = 350 / 5 = 70 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train passes a milestone in 6 seconds. If the speed of the train is 60 km/h, find the length of the train.
Correct Answer: Option A
Explanation:
Speed of train = 60 * (5/18) = 50/3 m/s. Length of train = Speed * Time = (50/3) * 6 = 100 meters.
Speed of train = 60 * (5/18) = 50/3 m/s. Length of train = Speed * Time = (50/3) * 6 = 100 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car driver leaves Bangalore at 8:30 AM and expects to reach a place 300 km away at 12:30 PM. At 10:30 AM he finds that he has covered only 40% of the distance. By how much must he increase the speed of the car to reach on scheduled time?
Correct Answer: Option D
Explanation:
Total time available = 4 hours. At 10:30 AM (after 2 hours), distance covered = 40% of 300 = 120 km. Remaining distance = 180 km. Remaining time = 12:30 PM - 10:30 AM = 2 hours. Required speed = 180 / 2 = 90 km/h. Original speed = 120 / 2 = 60 km/h. Increase in speed = 90 - 60 = 30 km/h.
Total time available = 4 hours. At 10:30 AM (after 2 hours), distance covered = 40% of 300 = 120 km. Remaining distance = 180 km. Remaining time = 12:30 PM - 10:30 AM = 2 hours. Required speed = 180 / 2 = 90 km/h. Original speed = 120 / 2 = 60 km/h. Increase in speed = 90 - 60 = 30 km/h.
This question belongs to:
Maths
Time Speed and Distance
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