Question

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

Answer 1

Answer:

40 seconds

Step-by-step explanation:

1st second she climbs up 5steps

next second she climbs down 2steps

so she climbs up 3 steps every two seconds

writing 60as a multiple of 3 we get

60 =3 × 20

so she climbs 60 stairs in 20 sets of two seconds each

therefore total time taken to climb 60 stairs is

40SECONDS