please help with 15 a and b!!! i need an explainer and to show my work. i will give brainliest answer!!!!!

Answer:
A)144km/h
B)5.4km/h
Step-by-step explanation:
A) 1m=0.001km
40m= 0.04km/s
0.04kmX60s=2.4km/min
2.4kmX60min= 144km/h
B)1.5m= 0.0015km/s
0.0015kmX60s=0.09km/min
0.09kmX60min= 5.4km/h