Question

A man who can swim in a lake at the rate of 120m a minute, finds that it takes 3 minutes more to swim up the river a distance of 480m than to swim the same distance down the river . What is the speed of the current ?

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Answer 1

Answer:

So, 120 m = 120 / 1000 km1 hour = 60 minutes. ... How much time will be swim a distance of 45 m? With the above speed how much distance will he cover in 50 s ?

Answer 2

Answer:

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Step-by-step explanation:

1 km = 1000 m. So, 120 m = 120 / 1000

km

1 hour = 60 minutes. So, 1 minute = 1/60

hour.

1 minute = 60 seconds %3|

Distance = 120 m = 120 / 1000 km

Time = 1 minute = 1/ 60 hour

Speed Distance / Time

in km / h = (120 / 1000) (1/60) = (120 * 60) / 1000 = 7.2 km/h

in m/s = 120 / 60 = 2 m/s

Distance = 45 m ; Speed = 2 m/s

Speed = Distance / time

2 = 45 / time

Time = 45/2= 22.5 seconds

Speed = 2 m/s ; time 50 s

Speed Distance / time

2 = Distance / 50

Distance = 50 * 2

Distance = 100 m

So, The speed in km/h is 7.2 km/h

The speed in m/s is 2 m/s

The person will take 22.5 seconds to swim a distance of 45 m

He will cover a distance of 100 m in 50 seconds.