Mr. P has two vacuum cleaners which are pictured below.
When he went to the store to buy a new vacuum, the salesman told him, "This vacuum will cut your work in half," so Mr. P said, "I'll take two." (the math didn't work out the way he thought it would).
Both models are cordless and run on a battery.
The Dyson V-8 has two modes, but the Dyson V-11 has three modes (Eco, Med, and Boost), and that is the vacuum that is used in this problem.
When fully charged, the Dyson V-11 can clean for 67 minutes in Eco mode, or it can clean for 33 minutes in Med mode, or it can clean for 15 minutes in Boost mode.
Mr. P needs to use the Boost mode for three minutes to do some heavy cleaning and he needs to use the Med mode for 8 minutes to clean some moderate areas.
How much time will he have left in Eco mode to finish cleaning his house before the vacuum needs to be recharged?