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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

If Lucy walks to work at a rate of 4 miles per hour, but she walks home by the same route at a rate of 6 miles per hour, what is Lucy's average walking rate for the round trip?

A. 4.5 mph
B. 4.8 mph
C. 4.0 mph
D. 5 mph
Explanation: