A group of explorers is stranded 2 miles from base camp. Their rescue vehicle has a fuel leak, losing fuel at a constant rate of 5 gallons per minute. The vehicle has a maximum tolerance for 60 gallons of fuel loss before it runs out. The driver maintains a constant speed of 5 miles per hour towards the base camp. What is the minimum rate, in gallons per minute, that a passenger must manually pump fuel from a reserve tank into the main tank to prevent the vehicle from running out of fuel before reaching base camp?
1.5
2
2.5
3
3.5
