A train travels from X to Y at the rate of 30 km per hour and from Y to X at the rate of 40 km/hr. What is the average rate for the whole journey?
A) 34 km/hr
B) 35.11 km/hr
C) 34.28 km/hr
D) 36 km/hr
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Average speed=30km/hr+40km/hr/2=35km/hr
*Average speed=35km/hr
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