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Let the actual speed of the car be 'x' km/h ATQ: Or, 60/x - 60/(x + 8) = 2 Or, 2x2 + 16x = 480 Or, x2 + 8x - 240 = 0 Or, x2 + 20x - 12x - 240 = 0 Or, x(x + 20) - 12(x + 20) = 0 Or, (x + 20)(x - 12) = 0 So, x = - 20, and x = 12 As speed cannot be negative So, x = 12 Original speed of the car is 12 km/h
Two trains, 'A' and 'B', are heading towards each other from opposite ends of a 360-meter bridge. Train 'A' travels at a speed of 15 m/s, and train 'B' ...
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800 metres long train crosses a man who is moving in the same direction with a certain speed, in 40 seconds. If the same train can cross a tree in 20 se...
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A train can cross a pole in 18 seconds. While if the train increased its speed by 75% then time taken by it to cross 444 metres long platform is 42 seco...
1600 metres long train crosses a man who is moving in the same direction with a certain speed in 25 seconds. If the same train can cross a pole in 20 se...
350 metre long train ‘A’ is running with a speed of 43.2 km/hr. Train ‘B’ which is 387 metre long is running with a speed of 90 km/h in opposite...
A train crosses a platform in 48 seconds travelling with a speed of 120 km/hr. If the length of the train be 600 metres, then the length (in metres) of ...
