book Maths Puzzle Numerical Ability

the inlet pipe of an oil tank can fill the tank in 1 hour 30 minutes. the outlet pipe can empty the tank in 1 hour. find how long it takes to empty a full tank if both pipes are

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book Other Question
The midpoint of line segment of RQ is P(4, -1). Give two possible coordinates of R and of Q. how many centimeter in one decimeter