What is the unit digit in 7^291?

 The rate at which a sum becomes four times of itself in 25 years at S.I.,will be: 

What day of the week was November 10, 2006 if November 24, 2007 was a Thursday?

What should come at the place of the question mark (?) in the following number series?

318, 160, 82, 44, ?

In how many different ways can the letters of the word 'DETAIL' be arranged in such a way that the vowels occupy only the odd positions?

 

The difference between the length and breadth of a rectangle is 23 m. If its perimeter is 206 m, then its area is:

 In a class of students, Ravi occupies fifth position from the top and 25th from the bottom in a test. How many students are there in the class? 

How many 4-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS' if repetition of letters is not allowed?

Rajesh and Rakesh working alone can complete a piece of work in 12 and 24 days respectively, Rajesh started the work and after a few days rakesh joined him and the work was completed in 10 days . After how many days did Rakesh join Rajesh?

A goods train leaves a station at a certain time and at a fixed speed. After 8 hours, an express train leaves the same station and moves in the same direction at a uniform speed of 90 km/h. This express train catches up with the goods train in 4 hours. Find the speed of the goods train.