A train went 300 miles from city X to city Y at an average speed of 80 miles per hours ( mph ). At what speed did the train travel on the way back if its average speed for the whole ( both ways ) trip was 100 mph?
Created: 6 years ago |
Updated: 3 years ago
best des
কালো রং এর কাপে চা তাড়াতাড়ি ঠান্ডা হয়। কারন কালো বস্তু তাপ শোষন করে তাড়াতাড়ি আবার তাপ বিকিরনও করে তাড়াতাড়ি।
Md Azizur Rahman
Founder of Satt
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