A bus 75 m long is running with a speed of 21 km/hr. In what time will it pass a woman who is walking at 3 km/hr in the direction opposite to that in which the bus is going? Choose the correct answer:
A) 5.75
B) 7.62
C) 11.25
D) 4.25
E) 3.25
Speed of bus relative to woman = 21 + 3= 
<gadget id="calculator">21 + 3</gadget>
<output>24</output>
24 km/hr.= 24 * 5/18 = 20/3 m/sec.   Time taken to pass the woman = 75 * 3/20= 
<gadget id="calculator">75 * 3/20</gadget>
<output>45/4 = around 11.25</output>
11.25 sec.   Answer: 11.25
<result>C</result>
A bus 75 m long is running with a speed of 21 km/hr. In what time will it pass a woman who is walking at 3 km/hr in the direction opposite to that in which the bus is going?