exam Maths Puzzle Numerical Ability

Could someone please show me how to multiply and then simplify this expression. I have a few other problems like it and I am not sure how to solve it.
sqrt 13 * sqrt 5
I understand that by multiping 13 * 5= sqrt 65
How do I simplify this????

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exam Other Question

The attendance at a concert was 1250. Admission was $20 each for adults and $10 each for children. Total receipts were $22,500. How many adults attended?

a) 750
b) 500
c) 250
d) 1000
e) none of the above
Two cyclists, 91 mi apart, start riding towards each other at the same time. One cycles just as fast as the other. If they meet 3 hr later, at what average speed is each cyclist traveling?