Competitions in road cycling of the tempo race type, involve cycling a track from A to B in the shortest time, usually cycling alone, and it is not allowed to take help from other cyclists, but there is a variant called team tempo, where you together in a team take help from each other by cycling in a so-called cluster. Road cycling is an endurance sport. Let us assume that endurance is measured in the amount of work done and that all cyclists are assumed to be equally enduring. A certain pace race runs along a track that is 30 km long. A lone cyclist manages to maintain an average speed of 42 km / h when the wind is calm. The track lacks slopes, which means that the dominant resistance when cycling is the air resistance.

How fast should a team tempo team with 6 cyclists cycle the track? Reply to the team\'s average speed [km / h].