CSC Company Numerical Ability Boats and Streams

A boat travels 72 km downstream in 8 hours and 84 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.

a) 8 km/hr, 1 km/hr b)5 km/hr, 4 km/hr c) 1 km/hr, 6 km/hr d)2 km/hr, 1 km/hr

Read Solution (Total 1)

Downstream speed=72km/8hrs
=9kmph
upstream speed=84km/12hrs
=7kmph
speed of boat=avg of downstream and upstream speeds
speed of boat=(9+7)/2kmph
=8kmph.
current speed=half of the difference of downstream and upstream speeds
currend speed=(9-7)/2kmph
=1kmph
ans is 8km/hr,1km/hr
12 years agoHelpfull: Yes(1) No(0)

CSC Other Question

A boat covers a distance of 30 kms in 2 ½ hours running down streams. While returning, it covers the same distance in 3 ¾ hours. What is the speed of the boat in kmph?

a) 12 b)8 c) 14 d) 10 A boat can row 18 kmph in still water.It takes twice as long to row up as to row down the river.Find the rate of stream.

a)6 km/hr b)7 km/hr c) 8km/hr d)5 km/hr