Mary jogs 9 km at a speed of 6 km per hour. At what speed would she need to jog

Question

Mary jogs 9 km at a speed of 6 km per hour. At what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging session ?

Options:

A . 9 kmph

B . 10 kmph

C . 12 kmph

D . 14 kmph

Answer: Option C

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