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A train went 300 miles from City X to city Y at an average rate of 80 mph. At what speed did it travel on teh way back if its average speed for the whole trip was 100 mph?

A train went 300 miles from City X to city Y at an average rate of 80 mph. At what speed did it travel on teh way back if its average speed for the whole trip was 100 mph? Correct Answer 133 1/3 mph

এখানে 3 টি average rate - একটি total, বাকি দুইটি যেতে (a) এবং ফেরত আসতে (b) avg rate. একটি formula দিয়ে ফেরত আসতে avg.rate বের করি। total avg. rate = 2ab/ (a + b) 100 = (2 ×80×b)/(80 + b) 100 = ( 160b)/( 80ub) 8000 + 100b = 160b 8000 = 60b b = 133.33 = 133 1/3 mph

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