A swimming pool is 100m long.A boy can swim across the length of the pool and then return to his starting position in 8 min.what is his speed in km/hour?
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Given data :
- length of pool = 100 m
- time taken = 8 minute
To find : What is boy's speed in km/hour ?
Solution : a/c to question; firstly we have to convert m into km and minutes into hour.
- length of pool = 100 m
- length of pool = 100/1000 km
- length of pool = 0.1 km
and
- time taken = 8 minute
- time taken = 8/60 hour
- time taken = 2/15 hour
Now,
- Total distance covered by boy in whole journey = 0.1 km * 2 = 0.2 km
By formula of speed,
⟹ speed = distance/time
⟹ speed = 0.2/ 2/15
⟹ speed = (0.2 * 15)/2
⟹ speed = 3/2
⟹ speed = 1.5 km/hour
Answer : Hence, speed of the boy is 1.5 km/hour.
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