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Arithmetic Aptitude :: Time and Distance

5. Raghav had to walk a certain distance. He walked half the distance at a speed of 4 km/hour and the remaining half at a speed of 5 km/hour. If the total time taken was 9 hour, the distance was

Answer: Option C

Explanation :

Let half of the distance travelled be d.
Time taken at the speed of 4 km/hr = (d/4)
Time taken at the speed of 5 km/hr = (d/5)
Therefore, total time = (d/4) + (d/5) = 9 hrs.
? (5d + 4d)/20 = 9
? 9d = 180
? d = 20.
Therefore total distance = d x 2 = 40 kms

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