Quantitative Aptitude - Arithmetic Ability Questions

Select the odd letters from the given alternatives.

A boat covers a distance of 14 km upstream and 16 km downstream in 9 hours. It covers a distance of 12 km upstream and 40 km downstream in 11hours. What is the speed (in km/hr) of the boat in still water?

How many natural numbers between 15 and 85 are divisible by 7?

What is the distance between the points (4,7) and (­1,­5)?

A boy crosses a 300 metres wide road in 30 seconds. What is his speed (in km/hr)?

Simple interest on a certain sum of money for 3 years at 14% per annum is half the compound interest on Rs. 10000 for 2 years at 10% per annum. The sum placed on simple interest is

If (9 - 3x) - (17x - 10) = -1, then the value of x is

If x-1x = 10, then find the value of x4+1x2