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

how do i write an complete proof be rearranging the reasons listed on the pieces of paper

reasons:
1transitive property of segment congruence
2addition property of equality
3 HI!
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find the equation for the line parallel to 2x-3y+6=0, with the same y intercept as y=7x-1

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