A car travels 140 km partly at a speed of 6 km/h and the remaining at a speed of 10 km/h. If the speeds, are reversed then it travels 8 km more in the same time. Then find the time takes by car to travel 140 km and also find what was the average speed of the car?

Options

A. 18 hour, `7 (7)/(9)` km./hr.
B. 16 hour, `8 (7)/(9)` km./hr.
C. 9 hour, `7 (7)/(9)` km./hr.
D. 8 hour, `8 (7)/(9)` km./hr.

Answer

A