+0  
 
+2
253
1
avatar+113 

Every day Mike leaves his farm at 11:30 a.m. to take a load of potatoes to the chip producers. If he averages 50 km/h he arrives at 1:54 p.m., but if he averages 80 km/h he arrives at 1 p.m. At what speed must he travel to arrive at 12:45 p.m.?

 

A) 84 km/h

B) 82 km/h

C) 90 km/h

D) 98 km/h

E) 96 km/h

jonathanxu999  Dec 2, 2017
edited by jonathanxu999  Dec 2, 2017

Best Answer 

 #1
avatar+12561 
+2

11:30 to 1:54   is  2:24 hr travel time   =   2.4 hours  

  2:4 hr x 50 km/hr = 120 km

 

120 km/80km/hr = 1.50 hr = 1hr 30 min    =~ 1 PM      OK....that checks out  (this is extraneous info)

 

11:30 to 12:45 is  1 hr 15 min    = 1.25 hr

 

120 km/1.25 hr = 96 km/hr  to arrive at 12:45 PM

ElectricPavlov  Dec 2, 2017
edited by ElectricPavlov  Dec 2, 2017
 #1
avatar+12561 
+2
Best Answer

11:30 to 1:54   is  2:24 hr travel time   =   2.4 hours  

  2:4 hr x 50 km/hr = 120 km

 

120 km/80km/hr = 1.50 hr = 1hr 30 min    =~ 1 PM      OK....that checks out  (this is extraneous info)

 

11:30 to 12:45 is  1 hr 15 min    = 1.25 hr

 

120 km/1.25 hr = 96 km/hr  to arrive at 12:45 PM

ElectricPavlov  Dec 2, 2017
edited by ElectricPavlov  Dec 2, 2017

20 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.