A boat goes 20 km downstream in 1 h and ...

A boat goes 20 km downstream in 1 h and the same distance upstream in 2h. The speed of the boat in still water is-

A

(A) 15 km/h

B

(B) 10 km/h

C

(C) 5 km/h

D

(D) 7.5 km/h

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