1.

A boat which has a speed of 5 km/hr in still water covers 1km upstream path in 15 minutes. How much distance it could cover in 1 hour 45 minutes in downstream?1). 72). 33). 44). 10.5

Answer»

Speed of water in STILL water = ½ × (speed downstream + speed upstrem)

Speed upstream = 1/(15 / 60) = 4

Let distance covered in downstream be n km

Time REQUIRED = 1 + 45/60 = 7/4

Speed downstream = n/(7/4) = 4n/7

Speed of water in still water = 5

⇒ 5 = ½ × (4n/7 + 4)

⇒ 10 = (4n + 28)/7

⇒ 70 = 4n + 28

⇒ 4n = 42

⇒ n = 10.5km

⇒ 10.5 km will be covered in downstream.


Discussion

No Comment Found

Related InterviewSolutions