Speed distance and time problem




From restaurant to house A,distance is 25km.time is 20 min but must change to hour so is 1/3 hour.

a)so speed= to distance/time= 25/1/3hour=75km/hour.ANS:75km per hour

b)From House A to B,distance is 16.2km,speed is the same as from restaurant to House A so the speed is 75km/hour.

Time=Distance/speed=16.2km/75km/h=0.216hour.ANS:0.216hour

c) the questions is he then travels back to the restaurant at an average speed of 50km/hour and reaches the restaurant at 12.08pm.

What is the distance between House A and B?
this c) question I don't know how to do so can help me?

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