By an engine the consumption of coal is directly proportional to the square of its velocity when velocity is 50 mile/hour then consumption is 18 kg. If cost of coal is 25 paise/kg and expenditure is 12.5 Rs/hour is another case. Then find the consumption in travelling 50 miles?
a) 93 kg
b) 80 kg
c) 75 kg
d) None of these
Sol:
