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A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance travelled
  • a)
    210 kms
  • b)
    30 kms
  • c)
    20 kms
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A car travels a certain distance taking 7 hrs in forward journey, duri...
Let say speed be x and distance be y
in forward 
x = y/7
7x = y

in return
x+12=y/5
5x+60=y
5x+60=7x
x =30 km/hr

y=210km in both cases
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A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance travelleda)210 kmsb)30 kmsc)20 kmsd)None of theseCorrect answer is option 'B'. Can you explain this answer?
Question Description
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