Question

The average speed of a car, a bus and a train together is 117 km/hr. andn ratio of their speed is 2 :4: 7. What is the average speed of a train and the bus together?

A 135.5 km/hr
B 148.5 km/hr
C 142.5 km/hr
D 151.5 km/hr
E None of these
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