Sam can mow a lawn in 20 min, while mark takes 10 min longer to longer to mow the same lawn. How long will they take to mow the lawn if they work together?

A 12 min
B 14 min
C 15 min
D more than 15 min

Correct Answer: 12 min

sam এর সময় লাগে 20 মিনিট Mark এর সময় লাগে = ( 20 + 10) = 30 মিনিট Sam ও Markএকত্রে কাজ করলে সময় লাগে ( 20 × 30) /( 20 + 30) মিনিট = 600/50 = 12 মিনিট।
Bissoy MCQ
#গণিত #Sonali Bank Ltd #Sonali Bank Ltd - Assistant Engineer (IT) - 26.08.2016

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