SOLUTION: A bus takes 48 minutes to cover a certain distance when travelling at a speed of 50 km/hr. How much time will it take to cover the same distance when travelling at a speed of 30 km

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A bus takes 48 minutes to cover a certain distance when travelling at a speed of 50 km/hr. How much time will it take to cover the same distance when travelling at a speed of 30 km      Log On


   

Question 482977: A bus takes 48 minutes to cover a certain distance when travelling at a speed of 50 km/hr. How much time will it take to cover the same distance when travelling at a speed of 30 km/hr. (Ans. 1 hour 20 minute)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+d+=+r%2At
+d+=+50%2A%2848%2F60%29+
+d+=+40+ km
The same distance at 30 km/hr takes
+40+=+30%2At+
+t+=+40%2F30+
+t+=+4%2F3+ hr
+t+=+3%2F3+%2B+1%2F3+ hr
+t+=+1+ hr and +%281%2F3%29%2A60+=+20+ min