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What is the correct answer?
4
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
Correct Answer :
C. 71.11 km/hr
$Totaltimetaken=\left(\frac{160}{64}+\frac{160}{80}\right)hrs.=\frac{9}{2}hrs.$
$\therefore Averagespeed=320x\frac{2}{9}km/hr=71.11km/hr.$
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