sentences:  The Duff/Clement Bentley was one of the fastest cars, Duff setting the fastest lap at 9 mins 39 sec for the 10.726 mile lap.Rough track conditions took their toll as a flying stone holed the fuel tank, forcing Duff to run back to the pits.As only the drivers could work on the cars, Clement had to bicycle back with a can of gas to power the car back to the pits.