MATHS-Word problem HELP!?!?

E K

New member
At a music festival, a band played a set of tunes for 40 minutes at a time. Then the band had a break of atleast 10 minutes before playing again.
The band began playing at 4pm and finisher their last set of tunes at 7pm. The band had more than one break. All breaks were of equal length.
How long were the breaks between sets
(A) 20 minutes
(B) 30 minutes
(C) 40 minutes
(D) 45 minutes

I'm terrible with word problems, and need some guidance.
What is the answer to this, and step by step working out (this isnt homework)
 
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