SOLUTION: david drove a total of 300km. he drove during equal periodss of time , 80km/h , 90km/h and 100km/h . how much time did he spend driving at 90km/h ? the answer should be approximatl

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: david drove a total of 300km. he drove during equal periodss of time , 80km/h , 90km/h and 100km/h . how much time did he spend driving at 90km/h ? the answer should be approximatl      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 499812: david drove a total of 300km. he drove during equal periodss of time , 80km/h , 90km/h and 100km/h . how much time did he spend driving at 90km/h ? the answer should be approximatly 1 1/9.
please get back to me as soon as possible and tell me how you got to your answer.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let t = the equal periods of time during which
he drove at 3 different speeds
given:
+300+=+80t+%2B+90t+%2B+100t+
+300+=+270t+
+t+=+1+%2B+30%2F270+
+t+=+1+%2B+1%2F9+
He drove 90 km/hr for 1 1/9 hr