Calculated 6048

The ambulance driver calculated that at an average speed of 60 km/h, he would arrive at the hospital in 50 minutes. After driving 25 km, he stopped at the pharmacy for 5 minutes. What average speed must he travel the rest of the way to make up for the delay?

Correct answer:

v2 =  75 km/h

Step-by-step explanation:

v1=60 km/h t=50/60=650.8333 h s=t v1=0.8333 60=50 km s1=25 km  s2=ss1=5025=25 km  t1=s1/v1=25/60=1250.4167 h t3=5/60=1210.0833 h t2=tt1t3=0.83330.41670.0833=310.3333 h  s2 = t2 v2 v2=s2/t2=25/0.3333=75 km/h



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