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Abhishek

· started a discussion

· 1 Months ago

Short Cut (Question: 285157.0 )

Are koi short cut batao bhai

Question:

At his normal speed, Ravi can go 18 km downstream in flowing river in 9 hours less than the same distance upstream. The downstream journey would take 1 hour less than what the upstream journey would take provided he doubles his rate of rowing. Find the speed of the river (in km/h)?

Options:
A)

5

B)

323    

C)

625    

D)

None of these

Solution:

Ans: (d)

  

Knowledge Expert

· commented

· 1 Months ago

Given method already short.
by equation 1 we get x^2-y^2=4y
by equation 2 we get 4x^2-y^2= 36y
subtract equation 1-2
we get x^2=32y/3
put the value in equation (1) we get y = 20/3

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