Question 161667
D=RT
T=D/R
7.5=D/15+D/10
7.5=(10D+15D)/150
7.5=25D/150
25D=7.5*150
25D=1125
D=1125/25
D=45 MILES FROM THE HARBOR TO THE ISLAND.
PROOF:
7.5=45/15+45/10
7.5=3+4.5
7.5=7.5