exam Maths Puzzle Numerical Ability

One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together, how long would it take them to stock the shelf ?

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exam Other Question

A plan flies 300 miles with a tail wind in 1 hour. It takes the same plan 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air? Five pencils and three erasers cost 65 cents. Three pencils and two erasers cost 40 cents. Find the cost of one pencil and one eraser.