The distance between S and T is 200 km. Radha travels from point S at a speed of 20 km/h and reaches point U in 2 hours, after that she travels at a speed of 25 percent more than previous and reaches point V in 4 hours, then find how many percent she decreases in her speed to travel the remaining distance in 6 hours.
1
60%
2
80%
3
75%
4
50%
5
None of these