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Q.

The speeds A and B are in the ratio 3 : 4. A takes 20 min more than B to reach a destination , In what time does A reach the destination 

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a

43hours

b

223hours

c

123hours

d

2 hours

answer is A.

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Detailed Solution

Let the time taken by A be x hrs

Then time taken by  B=(x2060)hrs

=x13hrs

Ratio of the speeds=Inverse ratio of times

3:4=(x13):x

x13x=343x13x=34

12x4=9x3x=4x=43

x=113hrs

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