Averages Q.4
- Option : C
- Explanation : As the distance is not mentioned, L.C.M. of 35 and
42, that is, 210 can be assumed to be the total distance.
Time taken from A to B = 210/35 = 6 hours
Time taken from B to A= 210/42 = 5 hours
Total Time taken = 11 hours
Average speed = (210 + 210)/(6 + 5) = 420/11 = 38.17 kmph
Alternatively, by applying direct formula
= 2xy/(x+y)
= (2*35*42)/35+42 = 38.17kmph
