Amar, Akbar and Anthony are playing a game. Amar climbs 5 stairs and gets down 2 stairs in one turn. Akbar goes up by 7 stairs and comes down by 2 stairs every time. Anthony goes 10 stairs up and 3 stairs down each time. Doing this they have to reach to the nearest point of 100th stairs and they will stop once they find it impossible to go forward. (They have less number of stairs than required forward stairs).
What is the second stair where any two out of three will meet together?

Options

A. Amar and Akbar will meet after 21 steps.
B. Akbar and Anthony will meet after 35 steps.
C. Amar and Anthony will after 21 steps.
D. Amar and Anthony will after 35 steps.

Answer

B

Explanation

As already calculated , LCM(3, 7) =21
Thus (b) is correct option.