Question
Laura drives to work at 12 km/h and comes back at 9
km/h. The total travel time for both trips is 7 hours. What is the distance from her home to work?Solution
ATQ, Total time = 7 hours Equation = d/12 + d/9 = 7 Common denominator = 36, so (3d + 4d)/36 = 7 Combine terms = 7d/36 = 7 Solve for d = d = 7 × 36/7 = 36 km
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