A boat can travel with a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
4 hr
4.25 hr
4.5 hr
6 hr
Explanation:
speed of boat in still water = 12 km/hr
speed of the stream = 4 km/hr
Speed downstream = (12+4) = 16 km/hr
Time taken to travel 68 km downstream $=\dfrac{68}{16}=\dfrac{17}{4}$ = 4.25 hours