Two express trains 220 meters and 180 meters long are tracking parallel in identical directions at speeds of 90 km/h and 72 km/h. Find the duration to pass each other. MCQ with Answer and Explanation
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Question #1
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A man covers 30 km of his journey at 10 km/h and the remaining 40 km at 20 km/h. Find his average speed for the whole journey.
Correct Answer: Option C
Explanation:
Total distance = 30 + 40 = 70 km. Time for first part = 30 / 10 = 3 hours. Time for second part = 40 / 20 = 2 hours. Total time = 5 hours. Average speed = 70 / 5 = 14 km/h.
Total distance = 30 + 40 = 70 km. Time for first part = 30 / 10 = 3 hours. Time for second part = 40 / 20 = 2 hours. Total time = 5 hours. Average speed = 70 / 5 = 14 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A passenger train 140 meters long passes an active bridge platform 310 meters long in 20 seconds. What is the speed of the train in km/h?
Correct Answer: Option C
Explanation:
Total distance = 140 + 310 = 450 meters. Speed = 450 / 20 = 22.5 m/s. In km/h = 22.5 * (18/5) = 4.5 * 18 = 81 km/h.
Total distance = 140 + 310 = 450 meters. Speed = 450 / 20 = 22.5 m/s. In km/h = 22.5 * (18/5) = 4.5 * 18 = 81 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A delivery van driver walks at 5 km/h and arrives 12 minutes late at his drop station. If he tracks at 8 km/h, he reaches 3 minutes early. Find the sector distance.
Correct Answer: Option B
Explanation:
Time difference = 12 - (-3) = 15 minutes = 1/4 hours. Let distance be d. d/5 - d/8 = 1/4 => 3d/40 = 1/4 => 3d = 10 => d = 3.33 km.
Time difference = 12 - (-3) = 15 minutes = 1/4 hours. Let distance be d. d/5 - d/8 = 1/4 => 3d/40 = 1/4 => 3d = 10 => d = 3.33 km.
This question belongs to:
Maths
Time Speed and Distance
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