Reena climbs up 5 stairs every second and then climbs down 2 stairs over the next second. How many seconds will she take to climb 60 stairs

Number of steps climbed by Reena every second = 5 stairs

Number of steps climbed down by Reena the next second = 2 stairs

For every 2 seconds, the number of steps climbed by Reena = 3 stairs

Total number of steps climbed by Reena = 60 stairs

Therefore, time take by Reena = (60/3)(20) = 40 seconds

Time taken by Reena to climb 60 stairs = 40 – 1 = 39 seconds

This is because when she climbs 5 stairs, she reaches 60 stairs which makes her not to climb down the next second.

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