Question
Mac travels from A to B a distance of 250 miles in `5 1/2` hours. He return to A in 4 hours 30 minutes. His average speed is :
Answer: Option D
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Speed from A to B = `(250 xx 2/11)` mph = `(500/11) `mph.
Speed from B to A = `(250 xx 2/9)` mph = `(500/9)` mph
`:.` Average speed = `((2 xx 500/11 xx 500/9)/(500/11 + 500/9))` mph.
= `((500000)/(4500 + 5500))` mph = 50 mph.
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