5.A train 100m long is moving with the velocity of 72km/hr. Find the time it takes to cross the bridge which is 2km long?
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Answer:
72/km
V= 72×1000m
÷
60×60= 72000÷3600s
720m ÷36s
20m/s
therefore 2×1000=2000m
2000m÷20m/s
100m/s
Explanation:
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