Question

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

Answer 1

Every 1 second Reena climbs 5 stairs

Every 2 seconds Reena climbs 5-2 is 3 stairs

Therefore she climbs 3/2 step in each second

So we have to divide 60 by 3/2 in order to get the time taken to climb 60 stairs.

Therefore it takes 40 seconds for Reena to climb 60 stairs