Ramesh and Suresh both ran a \(30\) mile marathon. Ramesh ran \(10\) miles at \(10\,\text{mph}\) and the the remaining \(20\) miles at \(5\,\text{mph}\). Suresh ran one third (by time) of the marathon at \(10\,\text{mph}\) and the remaining two thirds at \(5\,\text{mph}\). Which of the following must be true?
A. Average speed of Ramesh is greater than average speed of Suresh.
B. Average speed of Suresh is greater than average speed of Ramesh.
C. Average speed of Ramesh is equal to average speed of suresh.
D. Average speed of Ramesh is twice the average speed of Suresh.
E. None of the above.
The OA is B
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