A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is

A cyclist turns around a curve at 40 km/hr. If it rounds the curve at double the speed, its tendency .to overturn is:

A cyclist turns around a curve at 50 km//h ., If it rounds the curve to double the speed its tendency to overturn would be ,

A cyclist travels 20 miles at a second of 15 miles per hours. If he returns along the same path and the entire trip takes 2 hours, at what spped did he return?