answer my question
Attachments:
Answers
Answered by
21
Answer:
Let the speed of current be = x km/hr.
Distance covered by Pratik in downstream = 36 km.
speed of pratik in downstream = (12+ x km/hr)
Time taken = 36/12+x
Distance covered in upstream = 36km
speed of pratik in upstream = 12-x km/hr
Time taken = 36/12-x
Time taken in upstream = Time taken in downstream = 8 hrs.
36/12-x + 36/12+x = 8
36 (12+x) +36 (12-x) = 8 (12+x) (12-x)
36 (12+x + 12-x) = 8 (144-12x + 12x- x^2)
36×24 = 8 (144 × x^2)
36×8 = 144 - x^2
x^2 = 144 - 108
x^2 = 36
x = 6
The speed of current is 6 km/hr.
I hope it will help you..
Similar questions