Quantitative Aptitude - Arithmetic Ability Questions

The traffic lights at four different road crossings change after every 15 sec, 18 sec, 27 sec and 30 sec respectively. If they all change simultaneously at 6:10:00 hours, then at what time will they again change simultaneously?

Karteek is twice as good a foreman as Raju and together they finish a piece of work in 20 days. In how many days will Raju alone finish the work?

Select the odd word/letters/number/number pair from the given alternatives.

Find out the odd word/letters/number/number pair from the given alternatives.

Reflection of the point (-3,6) in the x-axis is

A train travelling at 76 kmph crosses a 450 m long platform in 27 seconds. What is the length of the train?

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

The inradius of a equilateral triangle is 10 cm. What is the circum-radius (in cm) of the same triangle?