An international crickets match between ganbia and india is scheduled to start in Banjul ( longitude 16° west at 90'clock am local time on 26th of June. Calculate the time and day that listeners will have to tune their radio for the start of the commentary at

(a) boundary which 74° east
(b) Pittsburgh which 80° west

1 answer

To calculate the start time of the cricket match in different time zones, we first need to determine the time difference between Banjul (16° west) and the other locations: Boundary (74° east) and Pittsburgh (80° west).

Information Given:

  • Match Time in Banjul: 10:00 AM local time on 26th June
  • Longitude of Banjul: 16° West
  • Longitude of Boundary: 74° East
  • Longitude of Pittsburgh: 80° West

Time Zone Calculations:

  1. Time difference calculation:

    • The Earth rotates 360° in about 24 hours, which translates to 15° per hour.
    • Thus, each degree of longitude corresponds to 4 minutes (60 minutes / 15° = 4 minutes).
  2. Banjul (16° W):

    • Local Time: 10:00 AM (UTC - 4 hours)
  3. Boundary (74° E):

    • Longitude difference from Banjul: \[ 74° E - 16° W = 74 + 16 = 90° \text{ (Total difference)} \]
    • Time difference: \[ 90° \times 4 \text{ minutes} = 360 \text{ minutes} = 6 \text{ hours} \]
    • Since Boundary is to the east of Banjul, we need to add the time difference to the local time of Banjul.
    • Start time in Boundary: \[ 10:00 \text{ AM} + 6 \text{ hours} = 4:00 \text{ PM} \text{ (26th June)} \]
  4. Pittsburgh (80° W):

    • Longitude difference from Banjul: \[ 16° W - 80° W = 64° \text{ (Total difference)} \]
    • Time difference: \[ 64° \times 4 \text{ minutes} = 256 \text{ minutes} = 4 \text{ hours, 16 minutes} \]
    • Since Pittsburgh is to the west of Banjul, we subtract this time difference from the local time of Banjul.
    • Start time in Pittsburgh: \[ 10:00 \text{ AM} - 4 \text{ hours, 16 minutes} = 5:44 \text{ AM} \text{ (26th June)} \]

Summary of Local Times:

  • Boundary (74° East): 4:00 PM on 26th June
  • Pittsburgh (80° West): 5:44 AM on 26th June

Listeners will need to tune in as follows:

  • Boundary: 4:00 PM on 26th June
  • Pittsburgh: 5:44 AM on 26th June