A person can swim at a speed of 4 km/h in still water. If the speed of the current is 2 km/h, then the time taken to swim 12 km downstream and return to the starting point is -
বিকল্পসমূহ (নিজের উত্তর যাচাই করতে ক্লিক করুন):
সঠিক উত্তর
2 (8 hours)
বিস্তারিত ব্যাখ্যা ও বিশ্লেষণ:
Solution:
Speed of the swimmer in still water = 4 km/h
Speed of the current = 2 km/h
Distance one way = 12 km
Downstream Speed = 4 + 2 = 6 km/h
Upstream Speed = 4 - 2 = 2 km/h
Time taken downstream = 12/6 = 2 hours
Time taken upstream = 12/2 = 6 hours
Total time = 6 + 2 = 8 hours
