velocity can be calculated using the following rule:
velocity = distance / time
therefore,
time = distance / velocity. ..................> equation I
distance = velocity x time ................> equation II
Part (a):
Substitute in equation I with velocity = 1 km/hr and distance = 115 Km to get the time as follows:
time = 115 / 1 = 115 hr
Part (b):
Substitute in equation II with velocity = 450 Km/hr and time = 2.5 hr to get the distance as follows:
distance = 450 x 2.5 = 1125 km