Question : Sajid drove for 6 hours at a rate of 60 km/hr and for 4 hours at 50 km/hr. What was his average speed for the whole journey?
Option 1: 52 km/hr
Option 2: 56 km/hr
Option 3: 54 km/hr
Option 4: 58 km/hr
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Correct Answer: 56 km/hr
Solution : Sajid drove for 6 hours at a rate of 60 km/hr. Total distance = 6 × 60 = 360 km Also, Sajid drove for 4 hours at 50 km/hr. Total distance = 4 × 50 = 200 km Average speed = $\frac{\text{Total distance}}{{\text{Total time}}}=\frac{360+200}{6+4}=\frac{560}{10}=56$ km/hr Hence, the correct answer is 56 km/hr.
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