exam Maths Puzzle Numerical Ability

May I please have some help with equation: h/4 = -16

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exam Other Question

Helped by a strong jet stream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400km trip in 30 min. less time than usual. At what speed does the plane usually fly? Find the length of the arc intercepted by a central angle of 65 degrees in a circle of radius 10 cm.