exam Maths Puzzle Numerical Ability

find the lcm of
2x+2 x^2-1 2x^2-2x+2

would it be 2(x+1)(x^2-1)(x^2-x+1) or 2(x+1)(x-1)(x^2-x+1)

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exam Other Question

The speed of a stream is 6 mph. If a boat travels 98 miles downstream in the same time that it takes to travel 49 miles upstream, what is the speed of the boat in still water? The problem has to do with calculating on-line travel revenue. It reads:
More & more travelers are booking on-line reservations. The following table lists the on-line travel rev