Question : A car covers the first 210 km at a speed of 70 km/h, it covers the next 170 km at a speed of 85 km/h. What is its average speed?
Option 1: 72 km/h
Option 2: 76 km/h
Option 3: 74 km/h
Option 4: 68 km/h
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Correct Answer: 76 km/h
Solution :
Distance covered in the first case = 210 km
Speed in the first case = 70 km/h
Time taken in the first case =
Distance covered in the second case = 170 km
Speed in the second case = 85 km/h
Time taken in the second case =
Average speed =
=
=
= 76 km/h
Hence, the correct answer is 76 km/h.
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