exam Maths Puzzle Numerical Ability

Sam drove a distance of of 410 miles in 7 hours. for the first part of the trip, his average speed was 40 mph and for the remainder of the trip, his average speed was 60 mph. how long did he travel at each speed?

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exam Other Question

if a line has a slope of 0 what can you say about the verticle coordinates of each the points on the line? Given the ATC function
TC=5000Q-100Q^2+1.0Q^3
a. What is the level of output that maximizes profit
b. Show the value of Q as in a. where it minimizes the ATC