At 7 a.m., Jen and Tiffany raced off together from the starting point of a pathway. Jen ran at an average speed of 1 m/s. Tiffany ran at an average speed of 2 m/s. Upon reaching the end of the pathway, Tiffany rested for 4 minutes. She then immediately ran back along the same route at 2 m/s. At 7.35 a.m., Jen met Tiffany.

1. Find the total distance covered by the two runners when they met each other. Express your answer in km.
2. Find the length of the trail in km.

(a)
From 7 a.m. to 7.35 a.m. = 35 min

Duration that Jen ran = 35 min
Duration that Tiffany ran = 35 -  4 = 31 min

1 min = 60 s

31 min = 31 x 60 = 1860 s
35 min = 35 x 60 = 2100 s

Distance that Jen ran
= 1 x 2100
= 2100 m

Distance that Tiffany ran
= 2 x 1860
= 3720 m

Distance that Jen and Tiffany ran
= 2100 + 3720
= 5820 m

1000 m = 1 km

5820 m = 5820 ÷ 1000 = 5.82 km

(b)
Length of the trail
= 5.82 ÷ 2
= 2.91 km

Answer(s): (a) 5.82 km; (b) 2.91 km