3.65 hours
2.73 hours
2 hours
5.66 hours

**
This section requires Javascript.
**

You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.

We would add the inverse of the time taken and then use the reciprocal as the result . 1/5+1/6= 11/30, now take its reciprocal ie. 30/11. This is your final answer.