# Keeps sliding!

**Algebra**Level 3

A man wants to climb a pole 50m tall pole. At first, he first climbs 1m but slides down 1m back to the ground. Then, he climbs 2m, but slides down 1m. Then, he climbs 3m, but slides down by 1m. Then, he climbs 4m, but slides down by 1m, and so on.

If the man spends 10 seconds for each meter he climbs up and 5 seconds for each meter he slides down, then how many seconds will it take him to reach the top of the pole?