ATC CALCULATION: An aircraft at 4,000 ft MSL is cleared to climb to FL180 (14,000 ft climb). The ground distance to the fix is 28 NM and groundspeed is 120 knots. What is the required Rate of Climb (ROC) in feet per minute?

1. 800 fpm
2. 1,000 fpm
3. 1,200 fpm
4. 1,500 fpm