Relative Motion
Q. Two trains are moving towards each other at speeds of 60 km/h and 90 km/h. If they are 300 km apart, how long will they take to meet?
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A.
1.5 hours
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B.
2 hours
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C.
2.5 hours
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D.
3 hours
Solution
Relative speed = 60 + 90 = 150 km/h. Time = distance/speed = 300/150 = 2 hours.
Correct Answer: B — 2 hours
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Q. Two trains are moving towards each other on parallel tracks. Train A is moving at 60 km/h and Train B at 90 km/h. What is their relative speed?
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A.
30 km/h
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B.
60 km/h
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C.
150 km/h
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D.
90 km/h
Solution
Relative speed = Speed of A + Speed of B = 60 km/h + 90 km/h = 150 km/h.
Correct Answer: C — 150 km/h
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