The average speed is given by:
average speed=(total distance)/(total time)
total time for the first 30 miles was:
time=distance/speed
=30/30
=1 hr
total time for the remaining 30 miles
=30/60
=0.5
hence the average speed will be:
speed=(30+30)/(1+0.5)=60/1.5=40 miles per hour
Answer:
Step--by--step explanation:
Answer:
1st cylinder: 3541.9 square mm
2nd cylinder: 439.6 square cm
Step-by-step explanation:
Second cylinder.