Question 225631
the FRACTION of the truck that Kyle loads is 15/24


the FRACTION that Kyle' brother loads is 15/B, where B is the brother's time alone


the two FRACTIONS sum to 1, the WHOLE job


15/24 + 15/B = 1







**********************SOLUTION BELOW*************************




multiplying by 24B (LCD) ___ 15B + 360 = 24B


subtracting 15B ___ 360 = 9B


dividing by 9 ___ 40 = B