| Duration (in hour) | 6-8 | 6-8 |
| Distance covered (in km) | ? | 240 |
A) 640 km
B) 240 km
C) 400 km
D) 480 km
Correct Answer: C
Solution :
\[\text{Average}\,\text{speed}\,\text{=}\,\frac{\text{Total}\,\text{Distnace}}{\text{Total}\,\text{Time}}\] Let the distance covered in first 6 h be\[x\,\text{km}\] Distance covered in next 2 hours = 240 km Total distance covered \[=(x+240)\,km\] \[\text{Average}\,\text{speed=}\frac{\text{Total}\,\text{distance}}{\text{Total}\,\text{time}}\] \[\therefore \]\[80=\frac{x+240}{8}\] or \[80\times 8=x+240\] or \[640=\text{ }x+240\] or\[x=640-240=400\text{ }km\].
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