A car after covering ½ of a journey of 100 km develops engine trouble and later travels at ½ of its original speed. As a result, it arrives 2 hours late than its normal time. What is the normal speed of the car is?  Choose the most appropriate option.
A) 287  B) 27  C) 28  D) 25  E) 28
[50/x + 50/(x/2)] – 100/x = 2   x = 25   Answer: 25
<result>D</result>
A car after covering ½ of a journey of 100 km develops engine trouble and later travels at ½ of its original speed. As a result, it arrives 2 hours late than its normal time. What is the normal speed of the car is?