A) 45 km/h
B) 40 km/h
C) 35 km/h
D) 30 km/h
Correct Answer: D
Solution :
| [d] Distance covered by car in 2 h, i.e., from 8.30 am to 10.30 am = 40% of 300 \[=\frac{40\times 300}{100}=120\,km\] Average speed of driver for first two hours \[=\text{ }\frac{120}{2}=60\,km/h\] Now, he has to cover the remaining distance, i.e., \[(300-120)\] 180 km in 2 h to reach on time \[\therefore \] Average speed for next two hours \[=\frac{180}{2}=90\,km/h\] \[\therefore \] He has to increase the speed by \[(90-60)=30\,km/h\] |
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