A man can row at 4 km/hr in still water. If the velocity of current is 3 km/hr and it takes him 8 hour to row to a place and come back, how far is the place?

Options
- 5 kms
- 6 kms
- 7 kms
- 8 kms

CORRECT ANSWER : 7 kms

Discussion Board
distance

Distance between 2 place=
[ (x^2-y^2) (t)] /2x
x=4km/hr
y=3km/hr
t=8
=[(16-9) (8) ]/2(4)
D=7kms

aishwarya 12-8-2020 02:29 AM

downstream = speed of still water + speed of current =4+3 =7km/hr upstream = speed of still water - speed of current = 4-3 = 1km/hr now, time = d/us + d/ds 8 = x/1 + x/7 8 = 8x/7

downstream = speed of still water + speed of current
=4+3 =7km/hr
upstream = speed of still water - speed of current
= 4-3 = 1km/hr
now,
time = d/us + d/ds
8 = x/1 + x/7
8 = 8x/7
x = 7kms

preethi 02-1-2019 06:07 AM

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