Question

An insect climbs a 10 m slippery rock in a minute and then slips down 9 m in the next

minute. How long will it take him to climb a 30 slippery rock?

Answer 1

it take 30 minutes to climb 30 slipperry rocks

Answer 2

Answer:

Time taken by the insect to climb 30 m slippery rock is 41 minutes

Step-by-step explanation:

Distance climbed by insect in 1 minute on slippery rock = 10 m

Slipping distance after 1 minute climbing = 9 m

So, total distance climbed after 1 + 1 =2 minutes = 10 - 9 = 1 m

Now, in 2 minutes the insect climbed 1 m

⇒ In 2 × 20 = 40 minutes the insect climbed 1 × 20 = 20 m

Then in the next minute or after 41 minutes the insect will climb 20 + 10 = 30 m and reach the destination.

So, time taken by the insect to climb 30 m slippery rock is 41 minutes