exam Maths Puzzle Numerical Ability

at 10:30 A.M. two planes leave Houston, one flying east at 560 km/h and the other flying west at 640 km/h. At what time will they be 2100 km apart?

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exam Other Question

Is -22 a:
Natural Number
Real Number
Interger
Rational Number
Irrational Number
Real Number

My answer: real number,whole number and an interger
A cyclon fence will cover a rectangular piece of land, which area measures 800fts cubics and the height of the land double its wide. How much feets of cyclon fence will need?