Arul, Ravi, and Ram working together can clean a store in 6 hours. Working alone, Ravi takes twice as long to clean the store as Arul does. Ram needs three times as long as Arul does. How long would it take each if they are working alone?

Peri needs 4 hours to complete a work. His friend Yuvan needs 6 hours to complete the same work. How long will take to complete if they work together?

Vinay and Praveen working together can paint the exterior of a house in 6 days. Vinay by himself can complete the job in 5 days less than Praveen. How long will it take Vinay to complete the job.

Pintu takes 6 days more than those of Nishu to complete certain work. If they work together, they finish it in 4 days. How many days would it take to complete the work if they work alone?

4 Indians and 4 Chinese can do a piece of work in 3 days. While 2 Indians and 5 Chinese can finish it in 4 days. How long would it take for 1 Indian to do it ? How long would it takes for 1 Chinese to do it ?

A particle of mass 1 g and charge 2. 5 xx10^(-4) C is released from rest in an electric field of 1.2 xx 10^4 NC^(-1) (a) Find the electric force and the force of gravity acting on this particle. Can one of these forces be neglected in comparison with the other for approximate analysis? (b) How long will it take for the particle to travel a distance of 40 cm? (c) What will be the speed of the particle after travelling this destance? (d) how much is the work done by electric force on the particle during this period?

The number density of free electrons in a copper conductor is 8.5xx10^(28)m^(-3) . How long does an electron take to drift from one end of a wire of 3.0 m long to its other end? The area of cross-section of the wire is 2.0 xx10^(-6)m^(2) and it is carrying a current of 3.0 A.