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Here is a question of speed ,time and distance... The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?

Here is a question of speed ,time and distance...


The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?

Grade:

1 Answers

Jitender Pal
askIITians Faculty 365 Points
12 years ago

Relative speed towards the stream of a boat

(20km/h+4km/h) X ( time)=120km

time= 120/24 h

time= 5 hrs

now relative speed against stream

(20-4)km/h X time = distance

16 km/h X 5 = distance

80 km

 

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