While travelling from Hyderabad to Bangalore by a car, the driver covers \(\frac{1}{4}\) of the distance at 60 kmph, \(\frac{1}{3}\) of the distance at 80 kmph, \(\frac{1}{6}\) of the distance at 100 kmph and the remaining distance at 50 kmph. Then his average speed for the whole journey, in kilometers per hour, is

• A. \(72 \frac{1}{2}\)
• B. \(70 \frac{5}{6}\)
• C. \(68 \frac{1}{6}\)
• D. \(66 \frac{2}{3}\)