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Prawin Mimicry

· started a discussion

· 1 Months ago

Confusing (Question: 259945.0 )

How do we get 90/72??

Question:

In a 100 m race, A runs at a speed of  53    m/s. If A gives a start of 4 m to B and still beats him by 12 seconds. What is the speed of B?

Options:
A)

54    m/s

B)

75    m/s

C)

43    m/s

D)

65    m/s

Solution:

Ans: (c)

  

Abhishek

· commented

· 1 Months ago

correction in the 4th line ..A beats B by 12sec

Abhishek

· commented

· 1 Months ago

100---> it is a 100m race(distance)
4 ---->Start provided by A
so now distance becomes = 100-4=96
time is 60sec for A and B beats him by 12sec ---> 60+12=72
So finally speed = distance/time = 96/72

Prawin Mimicry

· commented

· 1 Months ago

Sorry..How do we get speed of B as 96/72??
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