What is the ratio of simple interest earned on certain amount at the rate of 12% p.a. for 9 years and that for 12 years?
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A train travelling at the speed of 66 kmph crosses a 300 m long platform in 24 seconds. How long was the train?
A dishonest milkman buys milk at Rs 30 per litre and adds 1/5 of water to it and sells the mixture at Rs 32 per litre. What will be his gain?
If 2x-y2+(3y-2z)2=0, then the ratio of x:y:z is
Find the total surface area (in cm2) of a cube of side 7.5 cm.
If a boat goes a certain distance at 30 km/h and comes back the same distance at 20 km/hr, what is the average speed (in km/hr) for the total journey?
16/3 =
16/3 = 5.333.. = 5.3
A person crosses a 900 metres wide road in 120 seconds. What is his speed (in km/hr)?