Question

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?​

Answer 1

Step-by-step explanation:

In the 1st second she climbs 5 stairs

In the 2nd Second she depends 2 stairs

•In 2 second she climbs a total of (5-2)=3 stairs

•She can climb 3 stairs in 2 sec

She can climb 1 stairs in 2/3 sec

She can climb 60 stairs in 2/3*60 sec

=40 Sec...(Ans)