On a cross-country flight, point A is crossed at 1500 hours and the plan is to reach point B at 1530 hours. Use the following information to determine the indicated airspeed required to reach point B on schedule.

Distance between A and B: 70 NM
Forecast wind: 310° at 15 kt.
Pressure altitude: 8,000 ft.
Ambient temperature: -10°C
True course: 270°

The required indicated airspeed would be approximately

a. 137 knots.
b. 126 knots.
c. 152 knots.