My question is about the standardization of column b. I need these data to be in a format that makes it easier to construct graphics.

```
a<- c("Jackson Brice / The Shocker","Flash Thompson", "Mr. Harrington","Mac Gargan","Betty Brant", "Ann Marie Hoag","Steve Rogers / Captain America", "Pepper Potts", "Karen") 
b<- c("2:30", "2:15", "2", "1:15", "1:15", "1", ":55",":45", "v")

ab <- cbind.data.frame(a,b)

                               a    b
1    Jackson Brice / The Shocker 2:30
2                 Flash Thompson 2:15
3                 Mr. Harrington    2
4                     Mac Gargan 1:15
5                    Betty Brant 1:15
6                 Ann Marie Hoag    1
7 Steve Rogers / Captain America    1
8                   Pepper Potts  :45
9                          Karen    v

```

as outuput:

```
                            a        b
1    Jackson Brice / The Shocker 00:02:30
2                 Flash Thompson 00:02:15
3                 Mr. Harrington 00:02:00
4                     Mac Gargan 00:01:15
5                    Betty Brant 00:01:15
6                 Ann Marie Hoag 00:01:00
7 Steve Rogers / Captain America 00:01:00
8                   Pepper Potts 00:00:45
9                          Karen 00:00:00

```

If possible, the objects of the column b in the manipulable format of time.