What is the approximate value of c?
a. 1.0 km.
b. 317 km
c. 137.2 km
d. 12.0 km
i think this one is c

what is the approximate value of b?
a. 76 km.
b. 104 km
c. 317 km
d. 213 km
i think this one is d

when gottfried is at cruising altitude, his speed is 225 km/hr. approximately how much time does he spend at cruising altitude? (remember that speed is equal to distance divided by time, and pay close attention to the units.)
a. 27.7 minutes
b. 23,400 minutes
c. 0.46 minutes
d. 2.2 hours