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A family decides to take a long trip along a highway. Total distance of the trip is 60 km. Dad is determined to have an average speed of 140 km/h or more during this trip. They travel the first half of the trip with an average speed of 110 km/h. What should his average speed in the second half of the trip be in order for the dad to be satisfied with his driving?


A family decides to take a long trip along a highway. Total distance of the trip is 60 km. Dad is determined to have an average speed of 140 km/h or more during this trip. They travel the first half of the trip with an average speed of 110 km/h. What should his average speed in the second half of the trip be in order for the dad to be satisfied with his driving?


Grade:upto college level

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