Question : A person covers the first 35 km in 60 minutes and the next 40 km in 30 minutes. What is his average speed for the whole journey?
Option 1: 49 km/hr
Option 2: 42 km/hr
Option 3: 50 km/hr
Option 4: 63 km/hr
Correct Answer: 50 km/hr
Solution :
Average speed = $\frac{\text{Total Distance}}{\text{Total Time}}$
The person covers the first 35 km in 60 minutes and the next 40 km in 30 minutes.
Total Distance = 35 km + 40 km = 75 km
Total Time = 60 minutes + 30 minutes = 90 minutes = 1.5 hours
Average speed = $\frac{\text{Total Distance}}{\text{Total Time}}$ = $\frac{75}{1.5}$ = 50 km/hr
So, the average speed for the whole journey is 50 km/hr.
Hence, the correct answer is 50 km/hr.
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