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  1. 1/a - 1/b = 1/c
  2. 1/a + 1/b = 1/c
  3. 1/c + 1/b = 1/a
  4. 1/c + 1/a = 1/b
  5. None of these
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1 Answers

Option 2 : 1/a + 1/b = 1/c

Let the total distance be ‘x’

Time taken while travelling from Kolkata to Allahabad

⇒ (3x/5)/6a + (2x/5)/4b = x/10a + x/10b

Time taken while travelling from Allahabad to Kolkata = x/10c

Thus, x/10a + x/10b = x/10c

On solving,

∴ 1/a + 1/b = 1/c
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Related Questions

Each question presents a situation and asks you to make a judgement regarding that particular circumstance. Choose an answer based on given information. Three friends are waiting for a train on the railway station. Suddenly, a train passes by and each of them tries to remember the train number of the train written on each of the coaches. The train number was a 5-digit number. All must agree in order to confirm the digit of train number. 1. All three agrees that all the digits of the train number was different. 2. All three agrees that the difference of 3rd and 5th digit from left is equal to the 4th digit from the left. 3. All three agrees that the 1st digit was 1. 4. All three agrees that the 2nd digit was an even prime number. Which of the following would be most likely the train number?
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