Please help me with the solution...

Dear Student,

Distance between A and B (AB) = 220km
Speed of bus b/w A and B = 55km/hr
Time taken from A to B is 220/55 = 4 hr

Distance between B and C = 220km
Speed of bus b/w B and C = 110km/hr
Time taken from B to C is 220/110 = 2hrs

Hence, the time taken from A to B and then B to C is 6hrs(4+2).

Regards,

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