Speed of boat in still water is 21 kmph amp speed of current is 3 kmph The boat completes round trip...........

Quantitative Aptitude (SBI-CL) Boats and Streams

Speed of boat in still water is 21 kmph & speed of current is 3 kmph. The boat completes round trip from A to B & then back to A in 7 hrs. Find the distance between A & B.

36 km