A typist can type a sheet in 5 minutes. Another types at the rate of 10 sheets an hour, and a third typist types 3/4th number of sheets as the second in half the time. Find the average speed per typist per minute.

a. 59/3
b. 37/3
c. 59/360
d. 37/180

• 1st typist types 1 sheet in 5 mins ..so he can type 12 sheet in 60 mins (1:5::x:6)
  2nd typist types 10 sheet in 60 mins
  3rd typist types 3/4 of 2nd that means 3/4*10=15/2..so he can type 15 paper for 60 mins (15/2:30::x:60)
  so average speed per typist=(15+10+12)/(60+60+60) we get answer as 37/180
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