A motor cycle covers 40 km with a speed of 20 km/hr. Find the speed of the motor cycle for the next 40 km journy so that the average speed of the whole journey will be 30 km/hr?
ক
70
খ
52.5
গ
60
ঘ
60.5
সঠিক উত্তর: 60
Avg=d/t