28. A man walks 35 km partly at the rate of 4 km an hour, andpartly at – InterviewSolution

1.	28. A man walks 35 km partly at the rate of 4 km an hour, andpartly at 5; if he had walked at 5 km an hour when he walked at 4,and vice versa, he would have covered two km more in the same time.Find the time he was walking
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