so 310:62
treat as fraction
310/62
simplify by finding factors
310:2 times 5 times 31
62:2 times 31
we see a 2 times 32 in both so we divide top and bottom by (2 times 31) or 62
5/1=5
5 spins per second
5:1 is ratio
so if 495 spins then
5/1=495/x
multiply both sdies by x
5x=495
divide boht sides by 5
x=99
the answer is 99 seconds
