Question

S
3. 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?
?
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Answer 1

Answer:

Answer: She will climb 60 stairs on 39 seconds. The net climb for Reena is 3 stairs per 2 seconds. So she should take (60/3) *2=40 seconds