Question

What is the solve for ques 44 in this pic

Answer 1

A|-------------------------|C------------D|--------------------|B
Let distance between A and B = x
part 1 :- half distance cover with speed v and next half part Let V' speed .
then, average speed = 2vv'/(v + v')

part2 :- half time taken to cover remaining part with speed v1 and v2.
then, v' = (v1 + v2)/2

now, use v' in part 1 .

average speed = 2v(v1 + v2)/2/{ v + (v1 + v2)/2 }
= 2v(v1 + v2)/(2v + v1 + v2)
hence, option (1) is correct