Question

The current in a river is 1.0 meters/second. Britney swims 300 meters against the current. If she normally swims with a speed of 2.0 meters/second in still water, how long does it take her to complete the trip?

A.
100 seconds
B.
200 seconds
C.
400 seconds
D.
300 seconds

Answer 1

D) 300 seconds

Step-by-step explanation:

if the river is traveling 1 m/s and Britney is traveling 2 m/s, then half of her speed would be canceled out, resulting in her only traveling 1 m/s taking her 300 seconds or 5 minutes to complete the trip.

Answer 2

Her speed against current= speed in still water - speed of current
= 2 - 1 =1 meter/seconds
Time taken = distance/ speed
= 300/1
= 300 seconds