Three elephents A, B and C are moving al...

Three elephents A, B and C are moving along a straight line with constant speed in same direction as shown in figure. Speed of A is `5 m//s` and speed of C is `10 m//s`. Initially separation between A & B is 'd' and between B & C is also d. when 'B' catches 'C' separation between A & C becomes 3d. then the speed of B will be

`7.5 m//s`

`15 m//s`

`20 m//s`

`5 m//s`

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The correct Answer is:

B catches C in time t then `t =(d)/(u-10)`
Separation by this time has increased by 'd' between A and C hence
`(10-5) xxd/((u-10))=d`
u=15 m/s

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