A boat goes 8 km upstream in 24 minutes. The speed of stream is 4 km/hr. The speed of boat in still water is:
25 km/hr
26 km/hr
22 km/hr
24 km/hr
Explanation:
Speed upstream $=\dfrac{8}{\left(\dfrac{24}{60}\right)}$ = 20 km/hr
Speed of the stream = 4 km/hr
speed of boat in still water = (20+4) = 24 km/hr