Question 159793
D=RT
T=D/R
3.15=D/5+D/4
3.15=(4D+5D)/20
3.15=9D/20 CROSS MULTIPLY.
9D=20*3.15
9D=63
D=63/9
D=7 MILES BETWEEN A & B.
PROOF:
3.15=7/5+7/4
3.15=(4*7+5*7)/20
3.15=(28+35)/20
3.15=63/20
3.15=3.15