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September 2, 2014

September 2, 2014

Posted by **tanmay bhoite** on Wednesday, April 11, 2012 at 2:20am.

- physics -
**drwls**, Wednesday, April 11, 2012 at 2:48amFirst case:

Total distance = L (km)

Time at 40 km/h = 0.1 L/40

Time at 90 km/h = 0.9 L/90

Total time = (.0025+.01)L

Average speed = L/(.0125) = 80 km/h

Second case:

Total trip time = T

Distance covered at 40 km/h = 40*0.1T = 4.0 T km

Distance travelled at 90 km/h = 90*0.9T = 81 T km

Average speed = 85T/T = 85 km/h

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