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A two digit number is such that the prod...

A two digit number is such that the product of its digits is 18. when 63 is subtracted from the number, the digits interchange their places. Find the number.
OR
A plane left 30 minutes later than the scheduled time and in order to reach its destination 1500 km away in time it has to increase its spedd by 250 km/hr from its usual speed. Find its usual speed.

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The correct Answer is:
`x=750` km/h.
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ZEN PUBLICATION-QUADRATIC EQUATIONS-ZEN ADDITIONAL QUESTIONS (SHORT ANSWER (SA) TYPE - 2 - QUESTIONS)
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