5 is the correct answer I believe
Answer:

Step-by-step explanation:
observe

Answer:
zero
Step-by-step explanation:
A) 42,000m divided by 2 1/3 = 18,000m divide by 1000m to get km = 18km/hr
B) 18,000m divided by 60 to get minutes = 300m divide by 60 to get seconds = 5m/sec.