hamie7457 hamie7457
  • 06-03-2024
  • Physics
contestada

A boy runs for 10 min at a uniform speed of 9 km/h. At what speed should he run for the next 20 min so that the average speed comes out to be 12 km/h?
a) 18 km/h
b) 15 km/h
c) 12 km/h
d) 9 km/h

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