Question

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A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/h less, then it would have taken?

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Answer 1

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Let the speed of the train be x km/hr. Then

Time taken to travel a distance of 480km=x480hr

Time taken by the train to travel a distance of 480km with the speed (x−8)km/hr=x−8480hr

It is given that if the speed had been 8km/hrless, then the train would have taken 3 hours more to cover the same distance

∴x−8480=x480+3

⇒x−8480−x480=3 = x(x−8)480(x−x+8)=3 = x(x−8)480×8=3

= 3x(x−8)=480×8⇒x(x−8)=160×8 = x2−8x−1280=0

Answer 2

Answer:

Let the speed of the train be x km/hr. Then

Time taken to travel a distance of 480km=

x

480

hr

Time taken by the train to travel a distance of 480km with the speed (x−8)km/hr=

x−8

480

hr

It is given that if the speed had been 8km/hr less, then the train would have taken 3 hours more to cover the same distance

∴

x−8

480

=

x

480

+3

⇒

x−8

480

−

x

480

=3⇒

x(x−8)

480(x−x+8)

=3⇒

x(x−8)

480×8

=3

⇒3x(x−8)=480×8⇒x(x−8)=160×8⇒x

2

−8x−1280=0

Step-by-step explanation:

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