1.

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.

Answer»

`52 (2)/(3) km//hr `
`50 (1)/(3) km//hr `
`53(1)/(3) km//hr`
`40 km//hr`

ANSWER :C


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