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Average Speed of a Train for First 5 Hours Was 63kmph

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Average Speed of a Train for First 5 Hours Was 63kmph for next 3 hours was 58 km/hr and for the next 2 hours was 72 km/hr. What was the average speed of the train for the entire journey?

v(avg) = total displacement / total time

d1 = 63 km/hr • 5 hrs = 315 km
d2 = 58 km/hr • 3 hrs = 174 km
d3 = 72 km/hr • 2 hrs = 144 km

d(ttl) = 315 + 174 + 144 = 633 km
t(ttl) = 5 + 3 + 2 = 10 hrs

v(avg) = 633 km / 10 hrs = 63.3 km/hr

Answer 63.3km/hr.


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