A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:

A. 35.55 km/hr

B. 36 km/hr

C. 71.11 km/hr

D. 71 km/hr

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Correct Answer :

C. 71.11 km/hr

T o t a l t i m e t a k e n = (\frac{160}{64} + \frac{160}{80}) h r s . = \frac{9}{2} h r s .

∴ A v e r a g e s p e e d = 320 x \frac{2}{9} k m / h r = 71.11 k m / h r .