book Maths Puzzle Numerical Ability

I need to Factor polynomial, if possbile

xy - ty + xs - ts

Any help would be great:)

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book Other Question

If the doctor wanted to see how much you weighed,what would he use?For US and metric and /spoints A car starts at 7 AM and travels at 80 kph. Another car starts at 10 AM from the same place and goes in the same direction. How fast will it have to go to catch up with the first one by 4 PM of the same day?