A Hybrid car requires 12000 Kilo Joules of charge. There are 2 chargers available: A fast charger which can charge 400 Joules/second (and should be used after midnight) and a slow charger which can only charge 100 Joules/second. Robert starts charging his car at 8 PM. At midnight fast charger kicks in and both chargers continue charging until the car is totally charged. At what time, Robert's car will be fully charged?
TJ test prep practice problems for our students and readers. The problems provide a very small sampling of what Optimal TJ Prep students work with.