Question

Armaan climbs up 5 stairs every second and then climbs down 2 stairs over the next second .how many second will he take to climb 60 stairs​

Answer 1

Step-by-step explanation:

Number of steps climbed by armaan every second = 5 stairs

Number of steps climbed down by armaan the next second = 2 stairs

For every 2 seconds, the number of steps climbed by armaan = 3 stairs

Total number of steps climbed by armaan = 60 stairs

Therefore, time take by armaan = (60/3)(20) = 40 seconds

Time taken by armaan to climb 60 stairs = 40 – 1 = 39 seconds

This is because when he climbs 5 stairs, she reaches 60 stairs which makes her not to climb down the next second.

Answer 2

Step-by-step explanation:

He will climb 60 stairs on 39 seconds.

Armaan climbs up 5 stairs every second

He climb down 2 stairs over the next second

The net climb for Armaan is 3 stairs per 2 seconds.

Total he has to climb is 60 stairs

So he should take (60/3) *2=40 seconds.

Since in the last second he will not fall, he will reach a second before, that is by 39th second.

Time taken by Armaan to climb 60 stairs = 40 - 1 = 39 seconds

Hope it works..

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