Question

The ratio of the speeds of Karan and Arjun is 7:5 respectively. Manoj covers a distance of 840 km in 14 hours. If Arjun’s speed is 20% less than Manoj’s speed, how much time will Karan take to cover 672 km?

A 18 hrs
B 14 hrs
C 15 hrs
D 10 hrs
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