100. 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
✅ The correct answer is option C.
Total time taken =

160
+
160
hrs.
=
9
hrs.

64
80
2

Average speed =

320 x
2
km/hr
= 71.11 km/hr.

9

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