##### Need Help In Physics Problem Solving

 Physics Tutor: None Selected Time limit: 1 Day

A person travels by car from one city to another. She drives for 26.5 min at 88.4 km/h, 12.3 min at 97.4 km/h, 52.5 min at 33.5 km/h, and spends 15.7 min along the way eating lunch and buying gas.The distance between the cities along the route is 88.322 km

Jun 8th, 2015

26.5 min=(26.5/60)hrs=53/120 hrs at 88.4km/h: the distance covered is 88.4*(53/120)= 39.04km

12.3min=(12.3/60)hrs=41/200 hrs at 97.4km/h: the distance covered is 97.4*(41/200)=19.967km

52.5min=(52.5/60)hrs=7/8 hrs at 33.5km/h: the distance covered is 29.3125km

the total distance= 29.3125km+19.967km+39.04km

total distance= 88.3195km

=88.32 km

Jun 8th, 2015

The second half of the question was missing:

Determine the average speed for the trip. Answer in units of km/h.

Jun 8th, 2015

okay, the total distance is 88.322km, and toatal time covered is 26.5+12.3+52.5+15.7=107 minute

average speed=88.322km/(107/60)minutes

average speed=88.322km/1.78333333hrs

= 49.5264km/h

Jun 8th, 2015

...
Jun 8th, 2015
...
Jun 8th, 2015
May 26th, 2017
check_circle