The concept of cloud computing focuses on rationing of data and resources over an accessible network of nodes. A large network of nodes combine together to form a cloud and an application relying on it is called a cloud application. In previous researches, the cloudlet is submitted by the broker statically. This research paper focuses on optimizing the CPU time by migrating tasks dynamically to the virtual machines after checking the length of instruction or checking the CPU available at the high speed virtual machine. If the CPU is available at high speed virtual machine, then the task will be submitted to that virtual machine. The execution time for every task is calculated separately. The total time for execution comes out to be less than that of in first case. In this way, total time to execute tasks is decreased.