Question : John drives 250 km at 50 km/hr and then 350 km at 70 km/hr. Find his average speed for the whole journey in km/hr.
Option 1: 55 km/hr
Option 2: 60 km/hr
Option 3: 58 km/hr
Option 4: 65 km/hr
Correct Answer: 60 km/hr
Solution :
Time taken by John when he drives 250 km at 50 km/hr = $\frac{250}{50}$ = 5 hr
Time taken by John when he drives 350 km at 70 km/hr = $\frac{350}{70}$ = 5 hr
Average speed for the whole journey = $\frac{250 + 350}{5 + 5}$ = $\frac{600}{10}$ = 60 km/hr
Hence, the correct answer is 60 km/hr.
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