Manoj is interested in deep-sea scuba diving. He is able to dive 10 feet in 1 minute. While coming up his speed is 20 feet per minute. How much time will it take him to just touch the seabed at 200 feet below sea level and come back to the top?

Given: Manoj dives 10 feet in 1 minute. While coming up his speed is 20 feet per minute. The seabed is at 200 feet below sea level

To find:  Time it will take him to just touch the seabed at 200 feet below sea level and come back to the top

Solution:

 

 We know, $Time= \frac{Distance}{Speed}$

While going down:

$Time= \frac{200}{10}$

= 20 minutes

While coming up:

$Time= \frac{200}{20}$

= 10 minutes

Total time = 20 minutes + 10 minutes

= 30 minutes