A train travels 225 km in 3.5 hours and 370 km in 5 hours.find the average speed of train.
Options:
A) 80 kmph B) 60 kmph C) 70 kmph D) 90 kmph E) none of these

Rationale: "as we know that speed = distance / time for average speed = total distance / total time taken thus , total distance = 225 + 370 = 595 km thus , total speed = 8.5 hrs or , average speed = 595 / 8.5 or , 70 kmph . answer : c"
Answer: C