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      Question

      Out of a total distance of 280 km, Golu covers some part

      by bus, whose speed is 40 km/h, while the remaining part by car, whose speed is 20 km/h. If total time taken by Golu is 10 hours, then find the distance covered by Golu by bus.
      A 160 km Correct Answer Incorrect Answer
      B 120 km Correct Answer Incorrect Answer
      C 140 km Correct Answer Incorrect Answer
      D 180 km Correct Answer Incorrect Answer

      Solution

      Let the distance cover by bus be 'd' km.

      Distance cover by car = (280 - d) km

      So, (d/40) + [(280 - d) /20] = 10

      Or, (d + 560 - 2d) ÷ 40 = 10

      Or, 560 - d = 400

      Or, d = 160

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