Question

A train covers a certain distance at a speed of 24 km/h and the next same distance with a speed of 30 km/h and the next same distance with a speed of 40 km/h. find the average speed?

A 12.6 km/hr
B 30 km/hr
C 45 km/hr
D 37.8 km/hr
E 18.9 km/hr
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