Question

by eating which fruit we can get more sleep in nights

Answer 1

Answer:

Let man's rowing speed be "x" and the current speed be "y".

When rowing downstream, the current speed adds to the man's rowing speed. When rowing upstream, the current speed acts against the man's rowing speed.

distance=speed×time

so while moving downstream,

30=[x+y] × 5. (eqn-1)

while moving upstream

18=[x-y] × 5. (eqn-2)

adding eqn 1 &2 we get

48= 10x

so x= 4.8

putting this value of x in eithr eqn 1 or 2, we get the current's speed. y= 1.2 Km/hr

Answer 2

Answer:

by eating tart cherries you can sleep more.