Jemma takes 2 hours to swim the 4 miles from buoy A to buoy B. Tired from her swim, she then continues to buoy C at half her previous speed. If buoy C is 6 miles away from buoy B, how many more hours will pass before Jemma reaches Buoy C? Choose the correct choice from the following choices.
A) 4
B) 5
C) 6
D) 7
E) 8
Time taken for Jemma to reach buoy B is 2 hours.   The distance between the buoys is 4 miles.   Distance travelled/time taken = Average speed   Hence the average speed to travel the distance is 2m/hr   Now, she would have to travel 6 miles .   However as she is tired the speed is half or 1m/hr   Hence, it will take her 6 hours   (Option 6)
<result>C</result>
Jemma takes 2 hours to swim the 4 miles from buoy A to buoy B. Tired from her swim, she then continues to buoy C at half her previous speed. If buoy C is 6 miles away from buoy B, how many more hours will pass before Jemma reaches Buoy C?