can you solve this physics question on waves

Fig.a is a picture of a string with a periodic wave moving on it in the +x direction. Fig.b shows same piece of string 0.10 sec later. Example 33?: 1971 Question 53 {1 mark} What is the smallest velocityr of the wave consistent with this information? Example 338: 19T1 Question 54 {1 mark} What is the frequency of the wave corresponding to this velocity? Example 340: 19T1 Question 56 {1 mark} Which of the arrows on Fig. a shows the velocity of point P on the string