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?
Answer & explanation
Correct answer: option 4
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