9514 1404 393
Answer:
2 : 5
Explanation:
You know an hour is 60 minutes, so 1 hour 40 minutes is 60+40 = 100 minutes. Then the ratio is ...
40 min : 1 h 40 min = 40 min : 100 min = 40 : 100 = 2 : 5
(a common factor of 20 can be removed from 40 and 100)