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Sushil Karmakar

· started a discussion

· 1 Months ago

solution v dedo plz.... (Question: 372494.0 )

solution...?

Question:

A man swims for 3 hours downstream and then 3 hours upstream. In his whole process he cover a total distance of 18 km. If the speed of the stream is 2 kmph, for what more time will he have to swim upstream to reach the starting point?

Options:
A)

10 hours

B)

12 hours

C)

8 hours

D)

14 hours

Solution:

Ans: (b)


Akshay Kapoor

· commented

· 1 Months ago

Dear Student
Let the velocity of upstream be (v-2)
And, the velocity of downstream be (v+2)
Let the boat cover an x distance in downstream, thus the boat has to retrace the x distance in the upstream direction.
Speed in the downstream direction=v+2=x/3
x=3(v+2)
Speed in the upstream direction=v-2=y/3
y=3(v-2)
y amount of distance is already covered in the upstream direction,
More distance to be covered in the upstream direction = x-y
3(v+2)-3(v-2)=12km
The speed in the upstream =V-2=3-2=1
thus
the time taken to cover the remaining distance =12/1=12 hours
regards
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