Answer :
1 hour = 60 minutes.
60 minutes x 5/6 hour = 50 minutes.
50 minutes x 2/5 = 20 minutes.
They listened to music for 20 minutes.
1 hour = 60 minutes.
60 minutes x 5/6 hour = 50 minutes.
50 minutes x 2/5 = 20 minutes.
They listened to music for 20 minutes.