1.

A boat takes 3 hours to travel 30km downstream and takes 5 hours to return to the same spot upstream. Find the speed of the boat in still water. (km / hr) (1) 10km / hr (2) 8km / hr (3) 6km / hr (4) 5km / hr

Answer»

(2) 8km / hr

Suppose speed of boat = x km / hr 

Speed of stream = y km / hr

∴ (x + y)3 = 30 ⇒ x + y = 10

(x + y)5 = 30 ⇒ x + y = 6

On Adding

⇒ 2x = 16

x = 8

Speed of boat = 8km / hr



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