Question

Tannish travels from A to B at a speed of 20 km/h, from B to C at 15 km/h and from C to D at 30 km/h. If AB = BC = CD, then find Tannish’s average speed for the whole journey

A 22 km/h
B 19 km/h
C 20 km/h
D 21 km/h
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