1.

A body has speed V, 2V and 3Vin first 1/3 of distanceS, seconds 1/3 of S and third 1/3 of S respectively. Itsaverage speed will be(a) V(c)V3.(b) 2 V1818

Answer»

Total distance covered by the boy is s+s+s = 3s

now total time taken by the boy is s/v + s/2v and s/3v.

now avg. speed is given by = (total distance)/total time

= 3s/(s/v +s/2v+s/3v = 3s/(s/v)*(1+1/2+1/3)... s will cancel each other.

so , avg v = 3V/(11/6) = (18v/11) answer.

option c.

this is the correct answerthanks you



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