book Maths Puzzle Numerical Ability

Please help me with this word problem:

A boat travels 25 km upstream. On the return trip downstream, the boat traveled 5km per hour faster. If the trip took 10 min. less time, w

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At 10:00 A.M. , a car leaves a house at the rate of 60mi/h. At the same time,another car leaves the same house at a rate of 50 mi/h in the opposite
direction. At what time will t Use a reflection to argue that the base angles of an isosceles triangle are congruent.