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Doubt

intermediate(ipc)course (no) (1460 Points)

03 October 2011

a train travels a distance of 300km at a constant speed.if the speed of train is increased by 5 km an hour,the journey would have been taken 2 hours less.the original speed of train is ?

ans: 25km/hour.

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11 Replies

* Krishna * (CA Student) (6149 Points)
Replied 03 October 2011

By using formula

300km ÷ x ^km/_h = 300km ÷ (x + 5) ^km/_h + 2h

300h / x = (300h + 2h[x + 5]) / (x + 5)

300h(x + 5) = x(300h + 2h[x + 5])

300hx + 1500h = 300hx + 2hx² + 10hx

2hx² + 10hx - 1500h = 0

x² + 5x - 750 = 0

(x - 25)(x + 30) = 0

therefore, x = 25, or -30

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ARUN KUMAR (Financial Consultant ) (992 Points)
Replied 03 October 2011

THANKS FOR SHARING.....................................

suresh kumar G (Assistant) (59 Points)
Replied 03 October 2011

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suresh kumar G (Assistant) (59 Points)
Replied 04 October 2011

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* Krishna * (CA Student) (6149 Points)
Replied 04 October 2011

@ Suresh Kumar

You can join JK Shah classes, Mumbai. Contact below link:

https://www.jkshahclasses.com/contact.php

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suresh kumar G (Assistant) (59 Points)
Replied 05 October 2011

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