Alex can solve a problem in 4 minutes- Brian can solve the same problem in 1-5 th of the time taken by Alex- How long does it take Brian to solve the problem-

The correct option is A 48s Given that, the time taken by Alex to solve a problem is 4× 60=240s And Brain takes one fifth of the time taken by Alex to solve th ...

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Standard IX

Mathematics

Multiplication of Unlike Fractions

Alex can solv...

Question

Alex can solve a problem in 4 minutes. Brian can solve the same problem in ${\frac{1}{5}}^{t h}$ of the time taken by Alex. How long does it take Brian to solve the problem?

27s

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65s

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60s

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48s

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Solution

The correct option is D
48s

Given that, the time taken by Alex to solve a problem is $4 \times 60 = 240 s$

And Brain takes one-fifth of the time taken by Alex to solve this problem.

So, Brian takes $\frac{1}{5} \times 240$ = $\frac{240}{5}$ $= 48 s$

Hence, Brian takes $48 s$ to solve the problem.

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Alex can solve a problem in 4 minutes. Brian can solve the same problem in 15th of the time taken by Alex. How long does it take Brian to solve the problem?

The correct option is D 48s Given that, the time taken by Alex to solve a problem is 4×60=240s And Brain takes one-fifth of the time taken by Alex to solve this problem. So, Brian takes 15×240 = 2405=48s Hence, Brian takes 48s to solve the problem.

Alex can solve a problem in 4 minutes. Brian can solve the same problem in ${\frac{1}{5}}^{t h}$ of the time taken by Alex. How long does it take Brian to solve the problem?