A plan left 40 minutes late due to bad whether and order to reach its destinatio

Question

A plan left 40 minutes late due to bad whether and order to reach its destination 1600 km away in time, it had increase its speed by 400 kmph from its usual speed. Find the usual speed of the plane?

Options:

A . 600 km/hour

B . 400 km/hour

C . 1000 km/hour

D . 800 km/hour

Answer: Option D

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