Math, asked by rahuldaripa98, 5 months ago

The ratio of the speed of sprinter before and after coaching was 10:11. If he now takes 20
seconds to cover 132 meters, how long would he have taken earlier to cover double the distance?
O
46 seconds
0
44 seconds
0
23 seconds
o
22 seconds
SKIP
ANSWER​

Answers

Answered by amitnrw
0

Given : The ratio of the speed of sprinter before and after coaching was 10:11.

he now takes 20 seconds to cover 132 meters

To Find : how long would he have taken earlier to cover double the distance

Solution:

Distance = speed * time

takes 20 seconds to cover 132 meters

=> Speed = 132/20

=> Speed =  66/10  m/s

ratio of the speed    before and after coaching was 10:11

Before coaching = 10x  m/s

Then after coaching = 11x  m/s

11x  = 66/10

=> x = 6/10

=> 10x = 6  

Speed before coaching = 6 m/s

Distance = 2 * 132 = 264 m

Time Taken = 264/6  = 44  secs

He has Taken 44 secs  earlier to cover double the distance

Correct option is 44 secs

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