Quantitative Aptitude - Arithmetic Ability Questions

To cover a certain distance with a speed of 60 km/hr, a train takes 15 hours. If it covers the same distance in 12 hours, what will be its speed?

A train starts moving from a place P at 10:00 a.m. and arrives at another place Q at 5:30 p.m. on the same day. If the speed of the train is 50 km/hr, then what will be the distance (in km) covered by the train?

If x2-3x+1=0, then x+1x is (x≠0)

If Sinx = 4/5, then Sec2x - 1 = ?

There is 40% increase in an amount in 5 years at simple interest. What will be the compound interest of Rs. 25000 after 3 years at the same rate?

If x = a + 1a, y = a - 1a ,(a>0), then the value of x4+y4-2x2y2 is

If √(1 + cot2A) = x, then the value of x is

Among four students sitting in a row, average age of last three students is 20 years and the average age of first three students is 21 years. If the age of first student is 26 years, then what is the age (in years) of the last student?