quantitative aptitude test 110

Test # 110
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1. The fuel charge for running a train at uniform speed over a given distance of 80 km varies as the square of its speed and at 16 km/hr, it is found to be Its. 48 per hour. The fixed charges, ie salaries etc, amount to Rs 300 for every hour of run. What should be the most economical speed?

Quantitative Aptitude
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off the track
not concerned with the topic under discussion
My friend was off the track when he suggested that the problem was caused by someone else.
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