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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:
Answer & Solution
Correct Answer:
Option
C
$$\eqalign{
& {\text{Total}}\,{\text{time}}\,{\text{taken}} \cr
& = \left( {\frac{{160}}{{64}} + \frac{{160}}{{80}}} \right)hrs \cr
& = \frac{9}{2}\,hrs \cr
& \therefore {\text{Average}}\,{\text{speed}} \cr
& = \left( {320 \times \frac{2}{9}} \right)\,{\text{km/hr}} \cr
& = 71.11\,{\text{km/hr}} \cr} $$
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Logins=320/4.5=71.11