A car travels from P to Q at a constant speed. If its speed were increased by 20km/hr, it would have taken two hour lesser to cover the distance. It would have taken further 30 minutes lesser if the speed was further increased by 10 km/hr. The distance between the two cities
Choices: A) 100 km B) 120 km C) 150 km D) 180 km E) None of these
Explanation :   Let the distance between two cities = D,   D = x*t (x = usual speed and t is the actual time)   D = (X + 20)*(T -2) and D = (X +30)*(T – 2.5)   Solve the above equation, u will get T = 5 and X = 30, so distance = 30*5= 
<gadget id="calculator">30*5</gadget>
<output>150</output>
150 km   Answer – 150 km
<result>C</result>
A car travels from P to Q at a constant speed. If its speed were increased by 20km/hr, it would have taken two hour lesser to cover the distance. It would have taken further 30 minutes lesser if the speed was further increased by 10 km/hr. The distance between the two cities