The speed of boat in still water is 8 km/hr more than the speed of current. If a boat takes total 11 hr to cover 32 km

The speed of boat in still water is 8 km/hr more than the speed of current. If a boat takes total 11 hr to cover 32 km downstream and 40 km upstream. Find the speed of boat in still water.

(a)          7.61 km/hr

(b)          6.66 km/hr

(c)           3.27 km/hr

(d)          4.67 km/hr

Sol:

U = B – S = 8