Two cyclist start from the same places in opposite directions. One is going towards north at 18kmph and the other is going towards south 20kmph. What time will they take to be 47.5km apart?	Choose the correct choice from the following answers.
A) 1 1/4 hours	B) 2 1/3 hours	C) 4hours	D) 3 3/4 hours	E) 6hours
To be (18+20) km apart, they take 1 hour   To be 47.5 km apart, they take 1/38 * 47.5 = 1 1/4 hrs   1 1/4 hoursnswer is 1 1/4 hours
<result>A</result>
Two cyclist start from the same places in opposite directions. One is going towards north at 18kmph and the other is going towards south 20kmph. What time will they take to be 47.5km apart?