Question

the speed of a boat in still water is 10km/hr and the speed of a stream is 5km/hr . Find the time taken by boat to go 45km downstream​

Answer 1

Answer:

3hrs

Step-by-step explanation:

Given:

Speed of a boat in still water = 10 kmph

Speed of stream = 5 kmph

Total distance covered by boat in downstream = 45 km.

To find:

Time taken by boat to go 45km downstream=?

Formula used:

• Speed of boat in downstream = (A + B)

Where,

A = Speed of a boat in still water

B = Speed of stream

• Speed = distance/time

Solution:

Speed of boat in downstream = (A + B)

⇒ (10 + 5)

⇒ 15 kmph

Time taken by boat = distance /speed of boat in downstream

⇒ 45/15

⇒ 3 hrs

∴ Boat will cover 45 km downstream in 3 hours.

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