exam Maths Puzzle Numerical Ability Quadratic Equations

a boat goes upstream 30 miles and downstream 44 miles in 10 hours.the next day it goes upstream 40 miles and downstream 55 miles in 13 hours.what is the average speed of the boat and the stream?

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.6m+a=b solve for m Eleven years ago Hye was four times as old as her brother. In one year she will be twice as old as he is now. What are their ages now?