1. A stunt motorcyclist attempts to jump a stream of width, w, which is equal to 0.15n × value of h, where n is an integer value. The bank from which the motorcyclist takes off has height, h, above the level of the water in the stream. The opposite bank has a height of 0.3h. 

The time of flight of the motorcyclist is 6 s, and they only just make the opposite bank.

Which of the following cannot be a value of W?