Richa travels from A to B at the speed of 15...

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Richa travels from A to B at the speed of 15 km/h, from B to C at 20 km/h, and from C to D at 30 km/h. If AB = BC = CD, then find the Richa's average speed.

A. 19 km/h

B. 17 km/h

C. 18 km/h

D. 20 km/h

Answer: Option D

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