Question

on a 60 km track a person travels first 30 km at a uniform speed of 5m/s how far must train travel next 3 km so as to get an average of 40 km/hr for entire trip​

Answer 1

Explanation:

Given :

Total distance= 60km

speed during the first half journey= 30km/h

Average speed= 40km/h

To calculate

speed ( v2 ) for the 2nd half ??

solution

Average speed= Total distance/ Total time

Average speed = Total distance / t1 + t2

Where , t1 = 30/30 = 1 h

40 = 60/ 1 + 30 / v

40 ( v + 30 ) = 60v

v= 60km/h

Hence ,The answer is 60 km/h

Hope it helps you