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Question
A student takes 1.25 hours to travel from home to school at a speed of 4 km/h. By what percentage should hei increase his speed to reduce the time by 25% to cover the o distance from school to home?
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Answer
Distance between school and home =1.25×4=5km
decreasing 25% time will be = 1.25×75/100, so the speed will be = 5÷(1.25×75/100) = 16/3
te required answer is = [{(16/3)-4}/4]×100 = 33⅓%
