[tex] \boxed{\text {Distance = Speed } \times \text{Time}} [/tex]
Distance = 42 x 14 = 588 km
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[tex] \boxed{\text {Speed = Distance } \div \text{Time}} [/tex]
Speed = 588 ÷ 12
Speed= 49 miles/hour
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Answer: The speed of the truck must be increased to 49 miles/hour