Find the common difference for an arithmetic series with
a1=5 and S10 = 320.

6

Step-by-step explanation:

Let . We know the formula for the sum of an arithmetic sequence is:

Where n is the number term you are finding the sum up to, a1 is the first term, and an is the nth term. We can substitute what we have:

The formula to find the nth term of an arithmetic series is:

Where d is the common difference. Again, we can plug in what we have;

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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