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A train travelles at certain average speed for a distance of 54km and then travells a distance of 63km at an average speed of 6km/h more than the first speed. If it takes 3 hours to compleate the total journy what is its first speed

Posted by Mahadevan.K.P Devan 7 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Nitya Mishra 7 years, 3 months ago

Let the first speed be x km/hr. Then, 54/x+63/ (x+6) =3 9{6/x +7/(x+6)} =3 3{6(x+6) +7x}=x(x+6) x(x+6)=3(13x+36) x×x -33x-108=0

2Thank You

Diksha Singh 7 years, 3 months ago

Quadratic equations

2Thank You

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