Answer:
6.5 hours
Step-by-step explanation:
The required time = x
(70 + 50) * x = 780
120 x = 780
x = 780/120 = 6.5 hours
B.) 45
x=9
Equation: 5.60x=50.40
Solve: 5.60x=50.40
Divide both sides by 5.60 ( 5.60x/5.60 ) and ( 50.40/5.60 )