What would be the 40 yard dash time for a 50 yard dash run in 5.6 seconds?

For a 7 minute mile you will average 1 minute and 45 seconds per lap on a 400 meter track (four laps), although keep in mind your first lap should be a bit faster and each subsequent lap will almost certainly be slower than the ones before it, so you should try to get around 1:35 on your first lap, maybe? It all depends on your running style. You would have to run an average of 8.57 mph over the entire mile.