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Sagot :
Fran's upstream speed (against the current):
2.7 km/hr - 0.8 km/hr = 1.9 km/hr
Now we can answer each question by manipulating the distance formula to come up with our expression for calculating time:
rate x time = distance
time = distance / rate
Fran's upstream time = 9 / 1.9 = 4.7 hrs
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