Question

Q 11. There are three boats A, B and C. The speed of boat C in still
water is equal to the downstream speed of boat A. The speed of boat B
in still water is equal to the upstream speed of boat C. Boat C takes 12
hours to cover 192 km downstream. If the speed of boat B in still water
would have been twice its initial speed in still water, the time taken by
it to cover 150 km upstream would have been 12.5 hours.
If boat A travels with 50% more speed than its initial speed In another
river 'R' then it takes 14.5 hours to cover 290 km downstream. Boat C
decreased its speed by x% and takes 36 hours to cover 612 km
downstream in river 'R'. If the speed of boat B in still water is
increased by x%, then find the time taken by boat B to cover 225 km
downstream in river 'R'.
a) 15 hours
b) 12.5 hours
c) 14 hours
d) 10.5 hours
e) 16 hours​

Answer 1

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