Question : A car covered the first 100 km at a speed of 50 km/h. It covered the next 140 km at a speed of 70 km/h. What is its average speed?
Option 1: 60 km/h
Option 2: 62 km/h
Option 3: 58 km/h
Option 4: 64 km/h
Correct Answer: 60 km/h
Solution :
Here, the car covered the first 100km at a speed of 50 km/h
Time taken = $\frac{100}{50}$ = 2 h
Now,
The car covered the next 140 km at a speed of 70 km/h
Time taken = $\frac{140}{70}$ = 2 h
Total distance = (100 + 140) = 240 km
Total time taken = 4 h
Average speed = $\frac{\text{Total distance}}{{\text{Total time}}}$ = $\frac{240}{4}$ = 60 km/h
Hence, the correct answer is 60 km/h.
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