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  1. 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 ?
    1. 35.55km/hr.
    2. 71.11km/hr.
    3. 36km/hr.
    4. 72km/hr.
Correct Option: B

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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