SOLUTION: A swimmer takes 100seconds to swim 50m. In 1 years time he has increased it's speed by 25%. Wat is the time he took to swim 50m now.

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Question 831: A swimmer takes 100seconds to swim 50m. In 1 years time he has increased it's speed by 25%. Wat is the time he took to swim 50m now.
Answer by usyim88hk(157) About Me  (Show Source):
You can put this solution on YOUR website!
First, find out the speed he was last year:
50meters/100seconds = 0.5m/s
Then find out the speed of him now:
(0.5m/s)((1+0.25)/1)
=(0.5m/s)(5/4)
=(0.625m/s)
So now we can find the speed of the swimmer now
(50m)/(0.625m/s)
=80sec
So now he swim 50 meters for 80 seconds