A swimming pool is 50m long. A boy can swim across the length and then return to his starting point in 5 min. What is his swimming speed in km/hr?

Answer 1

To find his swimming speed in km/hr, we need to first convert the distance he swims from meters to kilometers.

Since the swimming pool is 50m long, the total distance he swims in one lap is 100m (50m across and 50m back).

Now, we need to convert this distance to kilometers. There are 1000 meters in 1 kilometer, so 100m is equal to 0.1km.

Now we know that he swims 0.1km in one lap.

Next, we convert the time it takes him to swim one lap and return to his starting point from minutes to hours. There are 60 minutes in 1 hour, so 5 minutes is equal to 5/60 = 0.0833 hours.

Now we can find his swimming speed in km/hr by dividing the distance he swims by the time it takes him to swim:

Speed = Distance / Time
Speed = 0.1km / 0.0833 hours
Speed ≈ 1.2 km/hr

Therefore, the boy's swimming speed is approximately 1.2 km/hr.