This requires us to find the number of permutations of 6 different bands taken 2 at a time:
Answer:
The eight represents a tenth/ten
Step-by-step explanation:
The 2 represents a two hundred, the 8 a eight tenth/eighty and the 1 a one
SOLUTION
At the same time t,
Train 1 would have covered a distance of 80t, since distance = average speed x time.
Train 2 would have covered a distance of 70t.
Now both added should give 210 miles
That is 80t + 70t = 210
150t = 210
t = 210/150
t = 1.4 hours