CBSE Class 9 Answered
in a 100 m race , A beats B by 20 m , or 4 sec. what is the speed of A?
Asked by abantikac1234 | 08 May, 2018, 08:46: PM
Expert Answer
Using speed = distance/time
Speed of B = 10/4 = 5 m/sec
Let time taken by A to cover 100 m = t sec
Time taken by B to cover 100 m = (t + 4) sec
Speed of B = 100/ (t + 4)
100/ (t + 4) = 5
20 = t + 4
t = 16 sec
Speed = 100/16 = 6.25 m/sec
Answered by Sneha shidid | 09 May, 2018, 10:21: AM
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