1.

Pls answer my question no.1

Answer»

Speed of the train in the FIRST 30 km, V1 = 30 km/h
Speed 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/h
I THINK it's HELP U



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