Question

a boat running upstream takes 8 hours 48 minutes to cover a certain distance while it takes 4 hours to cover same distance running downstream. What is the ratio between the speed of the boat and speed of the water current?​

Answer 1

Answer:

Let the man's rate upstream be x kmph and that downstream be y kmph. Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs. ⇒x×845=y×4⇒445x=4y⇒y=115x∴Requiredratio=y+x2:y−x2=(16x5×12):(6x5×12)=85:35=8:3.

Answer 2

Let the man's rate upstream be x kmph and

downstream be y kmph.

Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.

⇒x×845=y×4⇒445x=4y⇒y=115x

∴ Required ratio = y+x²: y−x² = (16x5×12) : (6x5×12) = 85:35

=8:3.