exam Maths Puzzle Numerical Ability

At 11 am Kate left clinton tollbooth travelling west at 809 km/h. At 12 pm, Juan left the tollbooth traveling west at 72 km/h. At what time will they be 98 km apart

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exam Other Question

Factor completely:
2x^2-50

Thanks for your help !
Simplify the expression, and combine like terms.
- (-5m + 3n - 4p)