Speed equation, algebra 1

Question

At 7 a.m. gene left Austin and headed south at 10 miles per hour. At 8 a.m. Anne left from the same place and headed south on the same road. If Anne was 60 miles ahead by 3 p.m. on the same day, what was her speed,

Answer 1

gene goes south at 10 mph at 7am

Anne goes south at 8am

if Anne was 60 miles ahead by 3pm, what was her speed?

10t = A(t-1)-60

10(8) =A(7) -60

80 = 7A -60

7A = 140

A = 140/7 = 20 mph= Anne's speed

And drove 7 hours at 20 mph = 140 miles

gene drove 8 hours at 10 mph = 80 miles

140-80= 60 miles ahead for Anne