| The respective ratio between the speeds of a car, a jeep and a tractor is 3: 5: 2. The speed of the jeep is 250% the speed of the tractor which covers 360 km in 12 h. What is the average speed of car and jeep together? |
A) 60 km/h
B) 75 km/h
C) 40 km/h
D) Cannot be determined
E) None of the above
Correct Answer: A
Solution :
| Speed of the tractor \[=\frac{360}{12}=30\,km/h\] |
| Speed of the jeep \[=30\times \frac{250}{100}=75\,km/h\] |
| Speed of the car \[=\frac{3}{5}\times 75=45\,km/h\] |
| Average speed of car and jeep together |
| \[=\frac{75+45}{2}=60\,km/h\] |
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