Fran swimming at aspeed of 5 mph in still water. The lazy river flows at speed of 2.3 mph. How long it will take fran to swim 1.8 mi upstream? 1.8 mi down stream.

It will take fran 0.67 hours to swim 1.8 mi upstream

it will take fran 0.25 hours to swim 1.8 mi downstream

Step-by-step explanation:

Fran's speed in still water = 5mph

speed of the river=2.3 mph

upstream journey

speed while swimming upstream = speed in still water-speed of the river=5-2.3=2.7mph

distance to be traveled upstream=1.8 miles

Time taken to swim = upstream distance/upstream speed

=1.8/2.7

=0.67 hours

Fran will take 0.67 hours to swim upstream

downstream journey

speed while swimming downstream = speed of Fran+speed of the river

=5+2.3=7.3mph

distance to be travelled downstream=1.8 miles

time taken=downstream distance / downstream speed

=1.8/7.3=0.25 hours