If two students starting from same point, walking in the opposite directions with 6km/hr and 9km/hr as average speeds respectively. Then the distance between them after 4 hours is?
Options:
A) 65 km  B) 55km  C) 15km  D) 60km  E) 75km
Explanation:   Total distance = 60kmistance traveled by person A+ 60kmistance traveled by person B   = (6× 4) + (9× 4)   = 24+ 36= 
<gadget id="calculator">24+ 36</gadget>
<output>60</output>
60 Km   Answer:60km
<result>D</result>
If two students starting from same point, walking in the opposite directions with 6km/hr and 9km/hr as average speeds respectively. Then the distance between them after 4 hours is?