Question 884670
A car travels 2 hours at uniform speed. If it will slow down to 1/2 of original speed, the car reaches its destination 30 minutes later covering a total distance of 84 km. What is the original speed?
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let x=original speed
distance=travel time*speed
..
2x+x/2*1/2=84
2x+x/4=84
9x/4=84
9x=336
x=37-1/3 km/hr
original speed=37-1/3 km/hr