Two cars start from the same places in opposite directions. One is going towards north at 60 kmph and the other is going towards south 40kmph. What time will they take to be 100km apart?  Choose the correct answer.
A) 1hr	B) 2hrs	C) 3hrs	D) 4hrs	E) 5hrs
To be (60+40) km apart, they take 1 hour   To be 100 km apart, they take   1/100 *100= 
<gadget id="calculator">  1/100 *100</gadget>
<output>1</output>
1 hr   1hrnswer is 1hr
<result>A</result>
Two cars start from the same places in opposite directions. One is going towards north at 60 kmph and the other is going towards south 40kmph. What time will they take to be 100km apart?