Question 264590
D=RT
630=(45-C)T
T=630/(45-C)
720=(45+C)T
T=720/(45+C) BECAUSE THE 2 TIMES ARE THE SAME SET THE 2 EQUATIONS EQUAL & SOLVE FOR C (THE CURRENT).
630/(45-C)=720/(45+C) CROSS MULTIPLY.
720(45-C)=630(45+C)
32,400-720C=28,350+630C
-720C-630C=28,350-32,400
-1,350C=-4,050
C=-4,050/-1,350
C=3 MPH. IS THE SPEED OF THE CURRENT.
PROOF:
630/(45-3)=720/(45+3)
630/42=720/48
15=15