Book Maths Puzzle Algebra

how do you factor 4a^2b + 28ab^2 + 7ab?

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Book Other Question

How would I start to solve this problem? A plane leaves an airport at 3 pm. At 4 pm. another plane leaves the same airport travelling the same direction at a speed 150 miles per hour faster than the first plane. Four hours after the first plane takes off, the second plane is 250 miles ahead of the first plane. Find the speed of each plane. How far did the second plane travel? Show me how to work this.

|3x-4| > 11