Question

By an engine, the consumption of coal is directly proportional to the square of its velocity. when velocity is 50 miles/ h coal consumption is 100 kg.if the cost of coal is 25p per kg and expenditure is 9 Rs./hour in the second case. Then find the consumption in travelling 250 miles.

Answer 1

Answer:

Step-by-step explanation:

consumption ∝ velocity^2

thus consumption/velocity^2 = constant

when velocity = 50 mh^-1

consumption = 100kg

constant = 100/50^2 = 100/2500 = 1/25

cost = 25p/kg

expenditure = 9rs/hr

= 900p/hr

coal he using per hr = 900/25 = 36kg