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

Answer:

IN 1 SECOND SHE CLIMBS UP 5 STAIRS

IN THE NEXT SECOND SHE CLIMBS DOWN 2 STAIRS.

THEREFORE, IN 2 SECONDS SHE CLIMBS 5-2 STAIRS=3 STAIRS.

THIS IMPLIES THAT SHE CAN CLIMB 1 STAIR IN 2/3 SECONDS.

THEREFORE, SHE CAN CLIMB 60 STAIRS IN 2/3*60 SECONDS = 40 SECONDS.

HOPE IT HELPS YOU.