Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | Broadcast date | Run time | Viewers (in millions) | Archive |
| --- | --- | --- | --- | --- |
| " Strangers in Space " | 20June1964 | 24:46 | 7.9 | 16mm t/r |
| " The Unwilling Warriors " | 27June1964 | 24:44 | 6.9 | 16mm t/r |
| " Hidden Danger " | 11July1964 | 24:53 | 7.4 | 16mm t/r |
| " A Race Against Death " | 18July1964 | 24:49 | 5.5 | 16mm t/r |
| " Kidnap " | 25July1964 | 25:47 | 6.9 | 16mm t/r |
| " A Desperate Venture " | 1August1964 | 24:29 | 6.9 | 16mm t/r |
Question:
What is run time when there were 7.4 million viewers?
Answer:
24:53