A man travels at a speed of 6 km/hr for five hours and at a speed of 4 km/hr for 10 hours. His average speed is

 a) 5
 b) 4 2/3
 c) 4 1/2
 d) 4 1/3
LDC 2010-Malappuram

2/3.
Solution
Average speed = Total distance/Total time = (6x5) + (4x10) = 70km
Total Time = 5+10 = 15
Average speed = 70/15 = 4 2/3
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