If it took a bus 4 hours to get from town A to town B, what was the average speed of the bus for the trip?

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If it took a bus 4 hours to get from town A to town B, what was the average speed of the bus for the trip?

(1) In the first 2 hours the bus covered 100 miles.
(2) The average speed of the bus for the first half of the distance was twice its average speed for the second half.

[spoiler]OA=E[/spoiler]

Source: GMAT Club Tests
Source: — Data Sufficiency |