how much time does Suresh take to cover a distance of 280 m, if he runs at a speed of 7 km/hr ?  Choose the correct choice from the following answers: A) 2 min. 24 sec. B) 3 min. 10 sec. C) 1 min. 56 sec. D) 4 min. 32 sec. E) None of these
Explanation :   Solution: s= 7 km/hr = (7*5/18) m/sec = 35/18 m/sec.   Required time = (280*18/35)= 
<gadget id="calculator">(280*18/35)</gadget>
<output>144</output>
144 sec.= 1min. 24 sec.   2 min. 24 sec.nswer : 2 min. 24 sec.
<result>A</result>
how much time does Suresh take to cover a distance of 280 m, if he runs at a speed of 7 km/hr ?