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?
Created: 6 years ago |
Updated: 3 years ago
best des
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
Md Azizur Rahman
Founder of Satt
Related Question
View More
Created: 6 years ago |
Updated: 1 month ago
Created: 6 years ago |
Updated: 2 days ago
Created: 6 years ago |
Updated: 2 days ago
Created: 6 years ago |
Updated: 2 months ago
Promotion
Download Our Mobile Apps
