1 . A train travels 10 miles at a speed of 50 miles per hour. How fast must the train teavel on the reture trip if the round-trip travel time is 20 minutes?
- A. 55 miles/hours
- B. 60 miles/hours
- C. 75 miles/hours
- D. 65 miles/hours
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বাংলাদেশ সেতু কর্তৃপক্ষ (সহকারী সাব-ইঞ্জিনিয়ার) 18-12-2020
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