# Discussion of Question with ID = 056 under Boats-and-Streams

## This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.

### Question

A man can row at \$1{3/13}\$ km/h in still water and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The downstream speed of the man is?

A

\$1{11/13}\$ km/h.

B

\$3{1/12}\$ km/h.

C

\${11/15}\$ km/h.

D

\$4{1/5}\$ km/h.

Soln.
Ans: a

If the distance travelled is D and the speed of the current is R km/h, we have \$D/{16/13 - R}\$ = 3 × \$D/{16/13 + R}\$. Cancelling D, and solving for R, we get R = \${8/13}\$ km/h. So downstream speed would be \${8/13}\$ + \$16/13\$ = \$1{11/13}\$ km/h.