A boat can travel with a speed of 13 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.
2 hours
3 hours
4 hours
5 hours
Explanation:
Speed downstream = (13 + 4) km/hr = 17 km/hr.
| Time taken to travel 68 km downstream =$ \left(\dfrac{68}{17} \right) $hrs = 4 hrs. |