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A man completes a journey in 14 hrs. He travels first half of journey at the rate of 15 km/h and the second half at the rate of 20 km/h. Find the total journey in km.
  • a)
    120 km
  • b)
    240 km
  • c)
    180 km
  • d)
    90 km
Correct answer is option 'B'. Can you explain this answer?
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A man completes a journey in 14 hrs. He travels first half of journey ...
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A man completes a journey in 14 hrs. He travels first half of journey ...
Solution:

Let the total distance be "2x" km (as he travels first half of journey at 15 km/h and second half at 20 km/h).

Speed = Distance/Time

Time taken for the first half = (x/15)

Time taken for the second half = (x/20)

Total time taken = 14 hrs

(x/15) + (x/20) = 14

4x/60 + 3x/60 = 14

7x/60 = 14

x = 120 km

Therefore, the total journey is 2x = 2*120 = 240 km

Hence, option B is the correct answer.
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A man completes a journey in 14 hrs. He travels first half of journey at the rate of 15 km/h and the second half at the rate of 20 km/h. Find the total journey in km.a)120 kmb)240 kmc)180 kmd)90 kmCorrect answer is option 'B'. Can you explain this answer?
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