Answer:
Fran's upstream speed (against the current):
2.9 km/hr - 0.1 km/hr = 2.8 km/hr
Fran's downstream speed (with the current):
2.9 km/hr + 0.1 km/hr = 3.0 km/hr
Using the distance formula for calculating time:
rate x time = distance
time = distance / rate
Fran's upstream time = 9 / 2.8 = 3.21 hrs
Fran's downstream time = 9 / 3.0 = 3.0 hrs
I believe it is a function
He has to wait 13 minutes for the 7:18 train
Multiply both sides by 10.
3y + 12 = 4x
subtract 12 and 4x from both sides.
-4x + 3y = -12
