Question

A boat rows downstream covers a distance of 20

km. in 2 hrs while it covers the same distance

upstream in 250% of the downstream time. Then

speed of the boat in still water is-

(A) 7 kmph (B) 8 kmph

(C) 9 kmph (D) 10 kmph​

Answer 1

Answer:

a

Step-by-step explanation:

20/x+y=2, 20/x-y=2*250/100

after solving both of them we get,

2x+2y=20and5x+5y=20

by elimination and substitution method, we get

x=7