avaya wrote:
A man covers the first 5 miles of the journey at the rate of 25 miles per hour, the next 10 miles at the rate of 30 miles per hour and finally the remaining distance in 30 minutes, thereby averaging 25 miles per hour for the entire journey. Approximately how much is the distance travelled in the last phase for the journey?
A. 9
B. 10
C. 11
D. 15
E. 20
Time taken for first 5 miles = 5/25 = 1/5 hrs
Time taken for next 10 miles = 10/30 = 1/3 hrs
time take for remaining "d" miles = 1/2
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