Calculate how much time could be saved if the train would run at its usual speed, given that it ran at 5/7 of its own speed and got to its destination in 15 hours?	Choose the most appropriate option.
A) 1.29 hrs B) 2.29 hrs C) 4.29 hrs D) 5.29 hrs E) 3.29 hrs
New speed = 5/7 of usual speed   New time = 5/7 of usual time   5/7 of usual time = 15 hrs   Usual time = 15*5/7 = 10.71 hrs   Time saved = 15-10.71= 
<gadget id="calculator">15-10.71</gadget>
<output>4.29</output>
4.29 hrs   Answer is 4.29 hrs
<result>C</result>
Calculate how much time could be saved if the train would run at its usual speed, given that it ran at 5/7 of its own speed and got to its destination in 15 hours?