If A is travelling at 72 km per hour on a highway. B is travelling at a speed of 25 meters per second on a highway. What is the difference in their speeds in m/sec.

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Answered by: pratibha

  • Nov 5th, 2007


5 m/sec

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bharathfeb

  • Jul 7th, 2009
 

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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shikha

  • Sep 26th, 2011
 

1 m/s

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jeevan ambati

  • Aug 30th, 2016
 

If the speed of B is converted in Km/hour it would be 80 km/hour... so the difference would be 80-72=8 km/hour or 8 km/hour

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jeevan ambati

  • Aug 30th, 2016
 

When we convert 25 m/sec into km/ hour we get 90 km/hour so the difference in their speeds would be
90-72=18 km/hour.. or 5 m/sec (18 km/hour converted in m/sec )

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