If doing 100 situps in a period of 15 minutes causes you to burn approximately 60 calories, how much calories will you burn if you did 40 situps in 1 minute?
100 sit ups in 1 minute will burn 900 calories (cal x 15 -- doing 15mins' work in 1 min)
40 sit ups in 1 minute will burn 360 calories (divide by 2.5 -- doing less situps in 1 min)
logically not realistic though