exam Maths Puzzle Numerical Ability

The speed of train A is going 18 mph slower then the speed of train B. Train A travels 220 miles in the same time that it takes train B to travel 310 miles. Find the speed of each train.

Train A-

Train B-

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Thank you in advance for your help with this problem. How many liters of 60% acid solution must be added to 14 liters of a 10% acid solution to produce a 25% acid solution? The height h in feet of an object after t seconds is given by the function
h = -16t2 + 30t + 7.
How long will it take the object to hit the ground? Round your answer to the