the speed of a car when travelling from a to b is 45km/h and from b to c is 60km/h. the distance between b and c is 175km and distance between a and c is 325km . find the total time taken.
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v1= 45 km/ h
v2= 60 km/h
d1= 150 km
d2 = (325-150)km = 175 km
tavg= d1/v1+ d2/v2
150/ 45+ 175/60= 6.2467 second
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