exam Maths Puzzle Numerical Ability

a swimming pool can be filled in 18 hours if water enters a pipe alone, or in 25 hours if filled through a hose alone. if water is entering through the hose and pipe both, how long will it take to fill the pool?

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exam Other Question

I need your help on this problem. a tree 40 feet high casts a shadow 68 feet long. Find the measure of the angle of elevation of the sun A horse and a cow togather cost $800.the horse is sold a a profit of 10% and the cow t loss of 10%.If the total profit of 2.5% is made,what is the cost price of the horse?