সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
A man can cross 10 miles distance of a river in favor of the stream in 2 hours. He can come back against the stream along the same way in 5 hours. What is the average speed, in miles per hour, for the entire trip?
A man can cross 10 miles distance of a river in favor of the stream in 2 hours. He can come back against the stream along the same way in 5 hours. What is the average speed, in miles per hour, for the entire trip?
- ক. 20/7
- খ. 10/7
- গ. 7/10
- ঘ. 7/20
সঠিক উত্তরঃ 20/7
এ সম্পর্কিত আরো প্রশ্ন দেখুন
- A man can rows 6 km/hr in still water. When the river is running at 1.5 km/hr, it takes him 1.5 hour to row to a place and back. How far is the place?
- A ferry can travel twice as fast when empty as when it is full. It travels 20 miles with full load, spends 1 hours for unloading & returns to its original port empty. It took 11 hours to complete the journey. What is the speed when the ferry is empty?
- A man can row upstream at 10 km/h and downstream at 16 km/h. His rate in still water is---
- A man can row downstream at 14 km/h and upstream at 8 km/hr. What is the rate of the stream?
- A man rows upstream 24 km and downstream 36 km, taking 6 hours each time. The velocity of the current will be:
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