Find the average speed of a car whose velocity-time graph is shown in the figure:
t(sec)
5
10
15
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A boy imagined a four digit multiple of 5 with different digits. If the first digit is erased, the obtained number is multiple of 9. If the second digit is erased, the obtained number is multiple of 11. If the third digit is erased, the obtained number is multiple of 7. What number a boy imagined?
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