Speed of river is 6 km/hr. Speed of a motorboat in still water is 30km/hr. How much distance can it cover downstream in 24minutes?
Answer & explanation
Correct answer: option 4
Speed of stream/river i.e. y = 6 km/hr
Speed of motorboat in still water i.e. x = 30 km/hr
Downstream speed i.e. x + y = 36 km/hr
As we know,
Speed = \(\frac{ Distance}{ Time}\)
36 = \(\frac{\text{ Distance x 60}}{ 24}\)
36 = \(\frac{\text{ Distance x 5}}{ 2}\)
36 x 2 = 5 Distance
Distance = 14.4 km