A man, on tour travel first 160 km, at 64 km/hr. and the next 160km at 80km/hr. the average speed for the first 320 km. of the tour is?

Q: A man, on tour travel first 160 km, at 64 km/hr. and the next 160km at 80km/hr. the average speed for the first 320 km. of the tour is?

Average speed = 2t1 x t2/( t1 + t2) = (2x64x80)/(64+80)km = (2 x 64 x 80 ) / 144 km/hr. =71.11km/hr.

35.55km/hr.
71.11km/hr.
36km/hr.
72km/hr.

Correct Answer: 71.11km/hr.

Explanation:

Average speed = 2t₁ x t₂/( t₁ + t₂)
= (2x64x80)/(64+80)km
= (2 x 64 x 80 ) / 144 km/hr.
=71.11km/hr.

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