Books like Five Get Into a Fix
Enid Blyton
Five Get Into a Fix is 188 pages, about 3 hours 27 minutes at 250 words a minute.
10 books to read next
How long each takes
Northern Lights 7.5 h 
King Solomon's Mines 4.1 h 
Treasure Hunters 8.3 h 
Furthermore 7.8 h 
Malice 6.9 h 
The Tin Princess 5.6 h 
Genius 5.6 h 
The Serpent's Secret 3.5 h 
Leepike Ridge 4.4 h Mrs. Smith's Spy School for Girls 5.6 h Bar height shows length. Estimated at 250 words a minute.