web2.0calc
 
+0  
 

 Daniel and the traffic

+1
366
1
avatar+328 

On a good day (or late in the evening), when there is no traffic, usually it takes Daniel 72 minutes to drive from Gilroy to San Francisco.Yesterday, when there was heavy conjestion, Daniel’s average speed was lower thanusual by 14 miles an hour, and he arrived late by 21 minutes.What is the distance (in miles) between Gilroy and San Francisco? Please answer the question to the nearest 10th of a mile.

 Jan 24, 2021

1+0 Answers

 #1
avatar
+2

d / r = 1.2 hr                         (72 minutes is  1.2 hr)

d = 1.2 r

 

d / (r-14) = 1.55 hr              (72+21 = 93 minutes is 1.55 hr)

 

Sub in d = 1.2r

 

1.2r/(r-14) = 1.55

  solve for r = 62 m/hr

 

62 m/hr * 1.2 hr = 74.4 miles

 Jan 24, 2021

0 Online Users

Top Users

avatar+128475 CPhill moderator
avatar+118609 Melody moderator
avatar+33616 Alan moderator
avatar+14915 asinus moderator
avatar+9519 MaxWong
avatar+3144 admin administrator
avatar+2440 GingerAle
avatar+1791 tomtom
avatar+1484 bader
avatar+1101 parmen
avatar+1032 kittykat

Sticky Topics