It takes Bela 1 hour to do a job that Hen… | Answer

Subject

Bank Exam

Topic

Southeast Bank Ltd. - Probationary Officer - 2016

It takes Bela 1 hour to do a job that Hena can do in 40 minutes. One day they worked together for 12 minutes and then Bela left. If Hena had finished the job, how long did it take for her to do it ?
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ক)

20 minutes

খ)

28 minutes

গ)

33 minutes

ঘ)

38 minutes

Explanation

Solution: বেলার একটি কাজ করতে 1 ঘন্টা সময় লাগে যেখানে হেনা সময় লাগে 40 মিনিট । একদিন দুইজনে একসাথে 12 মিনিট কাজ করার পরে বেলা কাজ ফেলে চলে গেল । যদি বাকী কাজ হেনা শেষ করে তবে, হেনার কত সময় লাগবে ? Bela 60 মিনিটে করে = 1 টি কাজ Bela 1 মিনিটে করে = 1/60 অংশ আবার, Hena 40 মিনিটে করে = 1 টি কাজ Hena 1 মিনিটে করে = 1/40 অংশ Bela এবং Hena একত্রে 1 মিনিটে করে কাজের =

(\frac{1}{{60}} + \frac{1}{{40}}) = (\frac{{2 + 3}}{{120}}) = \frac{5}{{120}} = \frac{1}{{24}}

অংশ কাজ Bela এবং Hena একত্রে 12 মিনিটে করে কাজের =

\frac{{12}}{{24}} = \frac{1}{2}

অংশ কাজ কাজ বাকি থাকে =

(1 - \frac{1}{2}) = \frac{1}{2}

অংশ কাজ এখন, Hena 1 বা সম্পূর্ণ কাজ করে = 40 মিনিটে Hena

\frac{1}{2}

বা সম্পূর্ণ কাজ করে =

\frac{{40}}{2}

= 20 মিনিটে ।

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It takes Bela 1 hour to do a job that Hena can do in 40 minutes. One day they worked together for 12 minutes and then Bela left. If Hena had finished the job, how long did it take for her to do it ?Reading

It takes Bela 1 hour to do a job that Hena can do in 40 minutes. One day they worked together for 12 minutes and then Bela left. If Hena had finished the job, how long did it take for her to do it ?

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It takes Bela 1 hour to do a job that Hena can do in 40 minutes. One day they worked together for 12 minutes and then Bela left. If Hena had finished the job, how long did it take for her to do it ?
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