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A car covers a distance of 270 kms with some speed. If the speed isdecreased by 10 km/hr, it will take 54 minutes more to cover the samedistance. Find the original speed of the car. |
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Answer» Answer: Let the original speed of the car =xkm/hr ∴ Time taken by it to cover 72km= x 72
hrs NEW speed of the car = (x+10)km/hr ∴ New time taken by the car to cover 72km= x+10 72
hrs As per the given condition, time is REDUCED by 36 minutes ∴ x 72
− x+10 72
= 60 36
x 2 +x−1200=0 On solving we get, x=−40 or x=30 Since the speed cannot be negative, so x=30km/hr. |
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