Question

Ram covers first 45 km at the speed of 15 km/hr. He covers next 40 km at the speed of 20 km/hr. He covers next 60 km at the speed of 30 km/hr. What is the average speed of Ram?

A 145/7 km/hr
B 121/9 km/hr
C 83/3 km/hr
D 96/5 km/hr
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