pratibha
Answered On : Nov 5th, 2007
5 m/sec

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ya the answer is 5sec..
converting 72kmph in m/sec we get 20m/sec
so 25-20=5sec/m

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189km/hrs
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72 km/hr == 20 m/sec .
so the diff is 25-20== 5m/sec
the final answer is 5m/sec.

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18km/hour

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20 m per sec
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5 m/s

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A is travelling at 72km/hr = 72*1000/3600 m/sec = 20 m/sec
B is travelling at 25m/sec= 25*3600/100 km/hr =90 km/hr
ANS-difference 5 m/sec,18 km/hr

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72 km/hr is 20m/s
Difference is 5 m/s

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5 m/sec..B is 5m/sec faster then A

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72kmph=72*1000m/60*60sec=20m/sec->A.
B->25m/sec
B-A=5m/sec

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A is travelling at 72 k/h [Given]
=> A is travelling at 72*5/18 m/s = 20 m/s
B is travelling at 25 m/s [Given]
Therefore, the difference in their speed is 5 m/s
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(1 km/hr = 5/18 mper sec)
so that, 72 km/hr=20mtr/sec
A's speed will be 20m/sec and B's speed will be 25 m/sec
hence the diff.of speed between them will be of 5 m/sec
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Step-1
Convert the speed of A in meter per second.
As 1km=1000meters and 1hour = 3600 second
=> 72km/hour =72x1000
60x60
=20meter/sec
Step-2
Now we can substract the speeds of A and B
Difference in speed= Speed of B- Speed of A
= 25-20
=5meter per second
Hence speed of B is more than A by 5m/s
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Change the meters into kilometer and sec into hrs after that equalize these two answers.
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1 meter/sec is the difference b/w the speeds
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Answer is 5m/s
when 72 converted to m/s becomes 20
and 25-20 = 5
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72 km/hr = 72* (5/18) m/sec = 20 /sec
so difference is 25 - 20 = 5 m/sec
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SPEED OF B= 25*60*60/1000=90km/hr
SPEED DIF.= 18
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To convert km/hr to m/s use 5/18
72*5/18=20m/s
25-20=5m/s
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5m/sec...
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shikha
Answered On : Sep 26th, 2011
1 m/s
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