Speed of the train in the FIRST 30 km, V1 = 30 km/hSpeed of the train in the next 90 km, v2 (to be determined)Average speed = 60 km/h = (v1 + v2)/2 = (30 km/h + v2)/2 ⇒ v2 = 90 km/hI THINK it's HELP U
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