Question

Working together Wayne and his son Garth can mow the lawn in 30 min, but if Wayne mow the lawn alone then it takes 1h 15min. Find how long does it take for Garth to mow their lawn if he does it alone.

Answer 1

105

Explanation:

I copied the other dude

Answer 2

105

Explanation:

1h and 15 minutes is 75 minutes so

30+75=

70+30=100

100+5=105