Lance is a local scrap merchant. He had to travel to the county recycling plant, 60 miles away. On the way there he could only manage a steady 12 miles per hour (mph), fully laden.

On the way back,Lance could manage a steady 16mph. He placed 24 gallons of fuel in the tank ready for the round trip, thinking that this would be enough as the wagon managed to travel 8 miles per gallon.

Unfortunately, a piece of metal pierced his fuel pipe at the start of the trip and the wagon started to lose 1 gallon of fuel per hour.

Luckily he only lost fuel when moving and he lost no fuel whilst unloading his scrap metal.

Were 24 gallons enough for the round trip?