A bus covered a distance of 160 km in 4 hrs covering a part of it at 30 kmph and the remaining at 70 kmph.For how much time did the us travel at 70 kmph?
a)0.5 hr b)1 hr c)1 1/2 hs d)2 hrs

• The answer to this is 1 hour.
  The bus traveling at 70km/p.h covers a distance of 70 kilometers
  So the remaining distance is 160-70=90
  The bus has traveled for 4 hours. 1 hour at a speed of 70 so remaining is
  3 hours. So speed=distance/time
  distance=speed * time
  =30*3=90 which is the remaining distance
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