book Maths Puzzle Numerical Ability

Slove for g S=1/2 gt exponent 2

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book Other Question

A train traveling at 100 kmph overtakes a motorbike traveling at 64 kmph in 40 seconds. What is the length of the train in meters? I am having trouble solving this inequality. Please help me. Thanks

-6 < 5y - (2y - 9)