Question : A person covers the first 25 km in 60 minutes and the next 38 km in 30 minutes. What is his average speed for the whole journey?
Option 1: 46 km /hr
Option 2: 49 km/hr
Option 3: 42 km/hr
Option 4: 36 km /hr
Correct Answer: 42 km/hr
Solution :
Given: A person covers the first 25 km in 60 minutes and the next 38 km in 30 minutes.
Total distance = 25 + 38 = 63 km
Total time = (60 + 30) = 90 minutes = $\frac{90}{60}$ = $\frac{3}{2}$ hours
So, the average speed = $\frac{63}{\frac{3}{2}}$ = $63×\frac{2}{3}$ = 42 km/hr
Hence, the correct answer is 42 km/hr.
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