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Mac travels from A to B a distance of 250 miles in 5 hours 30 minutes. He returns to A in 4 hours 30 minutes. His average speed is :
- A44 kmph
- B46 kmph
- C48 kmph
- D50 kmph
Correct answer: D
Discussion 1
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CCommunity
50 kmph
Speed from A to B = (250 x 2/11) mph = 500/11 mph.
Speed from B to A = (250 x 2/9) mph = 500/9 mph.
Average speed = [2x(500/11) x (500/9)]/[500/11 + 500/9] mph
Average speed = 500000/(4500+5500) = 50 mph
Speed from A to B = (250 x 2/11) mph = 500/11 mph.
Speed from B to A = (250 x 2/9) mph = 500/9 mph.
Average speed = [2x(500/11) x (500/9)]/[500/11 + 500/9] mph
Average speed = 500000/(4500+5500) = 50 mph