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Ben drove for 15 minutes at an acerage speed of 50 km/h at first. He then drove another 6 km at an average speed that was 44% more than his earlier speed. What was his average speed for the whole journey?

 Apr 8, 2021
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44% faster than 50 km/hr =  1.44 * 55  =  72 km/hr

 

Find distance @ 50 k/h   15 min = 1/4 hr        5o km/hr * 1/4 hr = 12.5 km

  Find TIME @ 6 km    6 km / 72 k/hr = 1/12 hr

 

 

distance / time = average speed

(12.5 + 6 km) / ( 1/4 + 1/12) = 55.5 km/hr average

 Apr 8, 2021

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