Two people, A and B, travel from X to Y along different routes. Their journeys take the same amount of time.
90 km
A's route
XC
Y
B's route
60 km
B travels at an average speed of 40 km/h.
What is A's average speed?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?