A person travels on through the sides of an equilateral triangle at speeds of 20 km/h, 32 km/h and x km/h, respectively. If the average speed of the travel is 24 km/h, then the value of x is:
1
\(21\frac{5}{7}\)
2
\(20\frac{4}{7}\)
3
\(22\frac{6}{7}\)
4
\(23\frac{5}{7}\)