An electirc train is going with the spee...

An electirc train is going with the speed km/hr and its electric pwer is thrice of firction force . When electric power is twice then due to any reason its firction force becomes `1(1)/(2)` times .Find its current speed.

`52(2)/(3)km//hr`

`50(1)/(3)km//hr`

`53(1)/(3)km//hr`

`40 km//hr`.

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