book Maths Puzzle Numerical Ability

2/3 - 5/6 = 1/x

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book Other Question

saul's army traveled 135 miles in 4 hours fewer than it took David's army to travel 945 miles. if the speed of David's army was three times that of Saul's what was the speed of eac (Please show steps and explain):

Susan drove 3.35 hours at a rate of 50 miles per hour. To the nearest tenth, how long would it take her to drive the same distance at a rate of 45 miles per hour?