A boat can travel with a speed of 19 km/h in still water. If the speed of the stream is 3 km/h, then what will be the total time (in hours) taken by the boat to go 88 km downstream and 24 km upstream?

5.5

We know that,

Downstream speed = Speed of boat in still water + Speed of stream

Upstream speed = Speed of boat in still water - Speed of stream

Speed of boat = 19kmph

Speed of stream = 3kmph

Downstream speed = 19 + 3 = 22kmph

Upstream speed = 19 - 3 = 16kmph

Required time = \(\frac{88}{22}\) + \(\frac{24}{16}\)

= 4 + 1.5 = 5.5