Question

A boat goes 12 km in 1 hour in still
water. It takes thrice the time in
covering the same distance against the
current. Find the speed of the current.

Answer 1

Answer:

8 km/hr

Step-by-step explanation:

v=d/t

let speed of boat be u

so, u=12/1= 12 km/hr

as to move against the river flow, the boat must have speed greater than tha speed of flowing river

let v be the velocity of river flow

as v and u are acting in opposite directions

therefore u-v will be the effective velocity

so, u-v = 12/3 =4

solving the equation we get v= 8