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April 19, 2015

April 19, 2015

Posted by **priya** on Tuesday, June 15, 2010 at 4:18am.

- physics -
**MathMate**, Tuesday, June 15, 2010 at 7:50amThe train travelled 30km at 30km/hr. It took therefore 30/30=1 hr.

To attain an average of 60km per hour over 120 km, the total time must be 120/60=2 hours.

There is (2-1)=1 hour left to do the remaining 90km. What should be the speed?

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