The sum of the speed of two trains is 727.7 miles per hour. if the speed of the first train is 8.3 mph faster than that of the second train, find the speed of each.

Which is the completely factored from of xy^3-x^3y

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.