Two mail sorters r & s work at constant rates. If r can sort x letters in 60 min, how long will it take for both the sorters working together but independently, to sort x letters.
a. 30
b. 33
c. 36
d. 28
e. 25

• If their constant sped is same, then
  both the sorters working together but independently will sort x letters in 60/2=30 mins.
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• since they are working with constant rate therefore 60/2=30
  
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• a. 30. both work at constant rates. if one can do t in 60min then two can do the same amount of work in half the time. .that's all
  
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• TIME TAKEN IS 28 BECAUSE IT IS WORKED BY 2 MEMBER SO THE TIME HALF BUT CROSS AREA SHOULD BE SORT BY ONE PERSON
  
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