The brigade covered 15 miles in 5 hours during the desert heat. When night came they were able to double their speed. How many miles could they cover in 7 hours at night?

Question

The brigade covered 15 miles in 5 hours during the desert heat. When night came they were able to double their speed. How many miles could they cover in 7 hours at night?

Answer 1

r = d / t

r = 15 mi / 5 hr

r = 3 mph

d = rt

d = 3 mph (7 hr)

d = 21 mi

Answer 2

Day:

speed = 15/5 = 3 mph

Night: speed = 6 mph

distance = speed X time = 6 X 7 = 42 miles.