A Car travels a distance of 400 km and consumes x km per litre of fuel. Then the driver gets the engine serviced. The same car then travels a distance of 400 km but the fuel consumption is (x+5)km per litre.
How many litres of pertrol is consumed in the total journey ? 
Do you think the driver could have saved more petrol ? if so, how ?     

Asked by renukanancyqueen2015 | 12th Dec, 2015, 10:34: AM

Expert Answer:

P e t r o l space C o n s u m p t i o n space i n space l i t r e s equals fraction numerator D i s tan c e space t r a v e l l e d over denominator k m divided by l i t r e end fraction T h u s comma space P e t r o l space C o n s u m p t i o n space i n space l i t r e s space b e f o r e space s e r v i c i n g equals 400 over x space l i t r e s A n d comma space P e t r o l space C o n s u m p t i o n space i n space l i t r e s space a f t e r space s e r v i c i n g equals fraction numerator 400 over denominator x plus 5 end fraction space l i t r e s T h u s comma space t h e space t o t a l space c o n s u m p t i o n space o f space p e t r o l equals 400 over x plus fraction numerator 400 over denominator x plus 5 end fraction D r i v e r space c o u l d space h a v e space s a v e d space m o r e space p e t r o l space b y space s e r v i c i n g space t h e space c a r space b e f o r e space s t a r t i n g space t h e space j o u r n e y.

Answered by Vimala Ramamurthy | 12th Dec, 2015, 03:38: PM