Question

train takes 20minutes to cover a distance of 19km. The ratio of the speeds of this train and another train is 3:4. How much time will the second train take to cover the same distance of 19km?​

Answer 1

Answer:

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Explanation:

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Answer 2

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Let original speed =xkm/hr

⇒ Time taken to travel = x90 hr

⇒ New speed =(x+15)km/hr

⇒ Time taken to travel = x+1590 hr

∴ x90 = x+1590 + 21

⇒ x90 − x+1590 = 21

⇒ 90( x1 − x+151 )= 21

⇒ x(x+15)

x+15−x = 1801

⇒ 15×180=x(x+15)

⇒ 2700=x 2 +15x

⇒ x 2 +15x−2700=0

⇒ x 2

+60x−45x−2700=0

⇒ x(x+60)−45(x+60)=0

⇒ (x+60)(x−45)=0

Speed can not be negative.

∴ The original speed of the train is 45km/hr

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