Time, Speed & Distance
Aptitude

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Q.

A passenger train takes two hours less for a journey of 300 km if its speed is increased by 5 km/hr from its normal speed. The normal speed is:

 A.

35 km/hr

 B.

50 km/hr

 C.

25 km/hr

 D.

30 km/hr

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Solution:
Option(C) is correct

Let the normal speed be '$s$' km/hr

Then new speed = $(s+5)$ km/hr

\(\dfrac{300}{s}-2=\dfrac{300}{s+5}\)

On solving this equation we get: 

$s$ = 25 km/hr


(2) Comment(s)


NerdBird
 ()

Someone solve: 2s^2+10^2+1500.

*^2 stands for raised to.


Anonymous
 ()

your equation is wrong. It should be Speed^2+5Speed-750=0

solution are 25 or -30 for that equation.

as speed can not be negative, the solution is 25.