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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take on (something) or take (something) on
to begin to do something, to commit oneself to something
Recently, my father has begun to take on too many things at work and he has become very tired. I took on the extra work to make some more money.
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