| A plane left 40 minutes late due to bad weather and in order to reach its destination, 1600 km away in time, it had to increase its speed by 400 km/hr from its usual speed. |
| Find the usual speed of the plane. |
A) 600 km/hr
B) 750 km/hr
C) 800 km/hr
D) 1200 km/hr
Correct Answer: C
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