Physics, asked by omjitripathisra6057, 1 year ago

A train takes 2 hours less for a journey of 300 kilometre if its speed is increase by 5 km/hr from its usual speed find the usual speed of train

Answers

Answered by lovera
1

we know that

speed =distance/time

speed=300/2

speed =150km/hr

Answered by Anonymous
0

Answer:

Let the usual speed of the train be y km / hr .

A.T.Q.

\displaystyle{\frac{300}{y} -\frac{300}{y+5} =2 }

300 ( y + 5 ) - 300 y = 2 y ( y + 5 )

y² + 5 y - 750 = 0

y² + 30 y - 25 y - 750 = 0

( y + 30 ( y -25 ) = 0

y = - 30 or y = 25

Since , speed of train can't be negative .

Therefore , the usual speed of the train is 25 km / hr .

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