Question 20
(2.5 points) Power $P$ is defined as a time rate of energy or the work done in a time interval $\Delta t$, $P=W/\Delta t$. There are two engines, A and B, which have a power ratio of 2:1. If engine A does a work of 1000 joule in 200 seconds, the work done by engine B in 300 seconds is ____________________________