alleryটাস্ক P এবং Q 4 এবং 6 h নেয় এবং একসাথে চলতে পারে; R উভয়ের পরে 3 h নেয়। সর্বনিম্ন মোট?
A9 h
B8 h
C7 h
D13 h
Answer & Solution
Correct answer: A. 9 h
চলতে P এবং Q একসাথে 6 ঘন্টা লাগে, তারপরে R এর 3 ঘন্টা, মোট 9 ঘন্টা।
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