Answer:
(a) The earliest time that Ferdo can be back at Juno station is 12:15
Step-by-step explanation:
From the given table, we have;
The starting time for train departure from Juno = 07:15
The frequency of train departures from Juno = Every 20 minutes
The time of departure, 't₁' of first train that departs from Juno after 08:30 is given as follows;
The train departure times from Juno = 07:15, 07:35, 07:55, 08:15, 08:35
Therefore;
The time at which the first train departs from Juno after 08:30 = 08:35
The time it takes a train to travel from Juno to Odiham = 0:805 - 07:15 = 50 minutes
The time of arrival of the train Ferdo takes from Juno at Odiham = 08:35 + 50 minutes = 09:25
The number of hours Ferdo spends at Odiham = 2 hours
The time after which Ferdo departs from Odiham = 09:25 + 02:00 = 11:25
The time of departure of the train from Odiham after 11:25 = 08:05 + 20 minutes × 10
Therefore, the time of departure of the train from Odiham after = 11:25
The time it takes on the trip back to Juno from Odiham = 50 minutes
The earliest time that Ferdo can be back at Juno station = 11:25 + 50 minutes = 12:15
