Reena climb up 5 stairs every second and then climb down 2 stairs over the next second. how many seconds will she take to climb 60 stairs?
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Stairs climbed up in 1 sec = 5
Stairs climbed down in 1 sec = 2
Thus , Stairs climbed in 2 seconds = 3
Therefore time taken to climb 60 stairs = 2×20= 40 seconds
Stairs climbed down in 1 sec = 2
Thus , Stairs climbed in 2 seconds = 3
Therefore time taken to climb 60 stairs = 2×20= 40 seconds
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