Question

reena climbs up 5 stairs every second and then climbs down two stairs over the next second. how many seconds will she take to climb 60 stairs​

Answer 1

Answer:

39 seconds

Step-by-step explanation:

In 2 seconds she climbs = 3 stairs

She climbs 54 stairs = (54/3)×2 seconds

= 36 seconds

In 37 seconds she will climb = 59 stairs

In 38 seconds she will climb = 57 stairs

In 39 seconds she will climb = 62 stairs

Which means she will cross 60th stair in 39 seconds.

So, she will take 39 seconds to climb 60 stairs.

Mark As Brainliest

Answer 2

Given data:

Reena climbs up 5 stairs Every second and then climb down 2 stairs over the next second.

To find:

The total time taken by Reena to climb 60 stairs.

Solution:

As for every second she climbs 5 stairs and in the next second she climbs down 2 stairs,

Total stairs she climbs in 2 seconds = 5 - 2 = 3 stairs.

Total number of steps climbed by Reena = 60 stairs  

Therefore, time take by Reena to climb 60 stairs

                                  = (60/3)(2)    [As she takes 2 seconds to climb 3 stairs]

                                  = 40 seconds

But, at 39th second, we know that she climbs 5 stairs making it 62, which means, she'll be out of the complete 60 stairs making it no need to climb down further.

So, Time taken by Reena to climb 60 stairs = 40 – 1 = 39 seconds

Therefore, the total minimum time taken by Reena to climb 60 stairs is 39 seconds.

Learn more:

Three taps A, B and C can fill a tank in 10 minutes, 15 minutes and 20 minutes respectively. If the taps were shut off after 5 minutes, what is the volume of water that overflowed in %?​

brainly.in/question/15608672

Amit climbs up 5 stairs in one second.He then climb down 3 stairs in next one second.How many seconds will he take to climb 62 stairs ?

https://brainly.in/question/21704309