b) A bus covers a distance of 90 km at a uniform speed. Had the speed been
15 km/hour more it would have taken 30 minutes less for the journey. Find the
original speed of the bus.
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Given; A bus covers a distance of 90 km at a uniform speed. Had the speed been
15 km/hour more it would have taken 30 minutes less for the journey
To Find; original speed
Solution; Let the original speed = x
Tx+1515
Time taken to cover 90 km = 90/x
Increased speed = x+15
90/x-90/x+15=12
x=-60 or x= 45
Hence original speed is 45
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