Question

13.
The speed of a motor boat itself is 20km/hr and the rate of flow of the river is 4
km/hr. Moving with the stream the boat went 120km. What is the distance will
the boat cover during the same time going against the stream?
2
1)80km​

Answer 1

Answer:

80km

Step-by-step explanation:

Boat moving with the stream so the

net velocity of the boat will be

20 + 4 = 24 ( as the velocity of boat and river is in the same direction)

so the time taken will be

Time = Distance ÷ Speed

Time = 120 ÷ 24

Time = 5hrs

now same time will be taken if boat travels against the motion of the river

Net velocity in this case will be

20 - 4 = 16 (as both are moving in opposite direction)

so the Distance will be

Distance = Speed × Time

Distance = 16 × 5

Distance = 80km

hope this answers the question

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