Answer:
4/5
Step-by-step explanation:
because if you can get a 5 every 1/6, then rolling anything else would be 5/6
90 yards in 15 minutes =6 yds/min
90 yards in 9 minutes =10 yds/min
x = current rate
r = rowing rate
r + x = 10
r - x = 6 Adding both equations
2 r = 16
rowing rate = 8 yds/min
x = 2 yds/min (current rate)
8 /8 =1
44/8=5,5
so the ratio is 1:5,5
x=8+sqrt-8/12, x=8-sqrt-8/12
I think...
