a man covers a certain distance q in a train. if the train moved 4 km / hr faster, it would take 30 min less. if it moved 2 km / hr slower, it would take 20 mins more. find the distance?
Choose the correct choice from the following options:
A) 200 km  B) 50 km  C) 20 km  D) 60 km  E) 80 km
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 4</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<result>D</result>
a man covers a certain distance q in a train. if the train moved 4 km / hr faster, it would take 30 min less. if it moved 2 km / hr slower, it would take 20 mins more. find the distance?
multiply(divide(subtract(multiply(4, 2), 4), const_2), 30)
not really . when you solve the 2 equation above , you get , 6 t - 4 / 3 = 5 r / 6 from simplifying equation 1 4 t - 2 = r / 2 from simplifying equation 2 you can now multiply equation 2 by 5 to get 5 ( 4 t - 2 = r / 2 ) = 20 t - 10 = 5 r / 2 and then subtract this new equation from equation 1 to get t = 3 , followed by r = 20 to give you distance q = r * t = 20 * 3 = 60 km . d