সব প্রশ্নে ফিরে যান
Math
If a man swims 4 miters upstream at 1 mph and back downstream to the same point at 4 mph, what is his average speed?
A) 0.8 mph
B) 1.6 mph
সঠিক উত্তর
C) 2.4 mph
D) 3.2 mph