Question

A person covered 80 km at a speed of 'z' km/h and then

another 100 km at a speed of (3z/2) km/h. If the total time taken for the journey was 320 minutes, find the value of 'z'.

A 27.5 km/h

B 45.5 km/h

C 56.6 km/h

D 20.5 km/h

E None of these

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