If two girls starting from same point, walking in the opposite directions with 7km/hr and 3km/hr as average speeds respectively. Then the distance between them after 12 hours is?  Choose the correct choice.
A) 120  B) 121  C) 122  D) 123  E) 124
Explanation:   Total distance = Distance traveled by person 120+ Distance traveled by person B   = (7Ã— 12) + (3Ã— 12)   = 84+ 36= 
<gadget id="calculator">84+ 36</gadget>
<output>120</output>
120 Km   120nswer:120
<result>A</result>
If two girls starting from same point, walking in the opposite directions with 7km/hr and 3km/hr as average speeds respectively. Then the distance between them after 12 hours is?