Using clock faces

This task is about showing time.
 
a)
Ben waited for the bus for 20 minutes. If he reached the bus stop at 7:40 a.m., at what time did the bus come?
 
__________
 
b)
Melanie ate her lunch in 10 minutes. She finished eating at 12:35 p.m.
On the clock face, show the time she started eating.
 

 

c) Show the time that is on each digital clock on the clock face below it.
 
    i)             ii)            iii)