exam Maths Puzzle Numerical Ability

I am trying to solve problem 10 on page 419. I do not understand how to find the base, when the area is already given in a triangle

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exam Other Question

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? What is the center and the radius of a circle with equation (x+1)^2+(y+3)^2=9/4?