Sajid drove for 6 hours at a rate of 60 kmph and for 4 hours at 50 kmph. What is his average speed for the whole journey?
Answer & explanation
Correct answer: option 2
Average speed = $\frac{Total\;distance}{Total\;time}$
Total distance = speed x time
= (60 x 6) + (50 x 4) = 360 + 200 = 560
Total time = 6 + 4 = 10
Average speed = $\frac{560}{10}$ = 56 km/h