Two boats start together and race across a 68-km-wide lake and back. boat a goes across at 68 km/h and returns at 68 km/h. boat
b goes across at 34 km/h, and its crew, realizing how far behind it is getting, returns at 102 km/h. turnaround times are negligible, and the boat that completes the round trip first wins.
Boat speed is 68km/h both to and fro. boat b speed to is 34km/h and back is 102km/h time taken by boat to is distance/speed= 68 km/68km/h=1 hour and fro is 68km/68km/h=1 hour for the whole trip boat a took 2 hours boat b speed to is 34km/h and distance is 68km, so it took 68km/34km/h = 2 hours to and fro it took 68km/102km/h=0.67 hours for the whole trip boat b took 2.67 hours so boat a is the winner as it took 2 hours to complete the challenge.
The lungs hold air that is taken in. Oxygen gas noticeable all around moves into the blood. The heart pumps to transports this oxygenated blood to cells in the body that need it to deliver vitality.
Distance is 90km,time 1 hr distance 2 is 82km,time 5 hrs average speed=total distance travelled/total time taken. 90+82=172/5+1=6 average speed=28.7km over hour
