Question

The speed of an express train is x km/h and the speed of an ordinary train is 12km/h less than that of the express train.If the ordinary train takes one hour longer than the express train to cover a distance of 240 km,find the speed of the express train.

Answer 1

HEY!
Let x=speed of express train
x-12=speed of slower train
travel time=distance/speed
..
240/(x-12)-240/x=1

LCD: x(x-12)
240x-240x+2880=x^2-12x
x^2-12x-2880
(x+48)(x-60)=0
x=-48(reject x>0)
or
x=60 
ans:
Speed of the express train=60 km/hr

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Answer 2

Answer:

Step-by-step explanation:

hello to all budies

Let x=speed of express train

x-12=speed of slower train

travel time=distance/speed

..

240/(x-12)-240/x=1

LCD: x(x-12)

240x-240x+2880=x^2-12x

x^2-12x-2880

(x+48)(x-60)=0

x=-48(reject x>0)

or

x=60 

ans:

Speed of the express train=60 km/hr

DONT FORGET TO MARK AS BRAINLEST AND THANKS!