Question

64.
A boat takes 2 hours to go 8 km and come back
in still water lake With water velocity of 4km/hr,the
time taken for going upstream of 8 km and coming
back s
(1) 140 min
(2) 150 min
(3) 160 min
(4) 170 min​

Answer 1

Explanation:

Velocity of boat = (8+8)/2

=8 km/h

Velocity of water =4 km/h

⟹t= 8/(8−4) + 8/(8+4)

t= 8/4 + 8/12

= 2+2/3= 8/3 h

=8/3×60 min =160 minutes

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