Question

At Greenwich meridian it is 12:00 noon then what is the time at a)mumbai 78° b)sydney 150° east longitude c) chicago 90°west longitude

Answer 1

Explanation:

GMT = 12 : 00 = 1200 hrs

a) Mumbai lies to the east of GMT

Time difference between 1° longitude = 4 min

78° longitude = 78 × 4 = 312 mins = 5 hrs 12 min

We will add time since Mumbai is on East

Hence local time at Mumbai = 1200 + 0512 = 1712 hrs = 5 : 12 pm

b.) Sydney lies to the east of GMT

Time difference between 1° longitude = 4 min

150° longitude = 150 × 4 = 600 mins = 10 hrs

We will add time since Sydney is on East

Hence local time at Sydney = 1200 + 1000 = 2200 hrs = 10 pm

c) Chicago lies to the west of GMT

Time difference between 1° longitude = 4 min

90° longitude = 90 × 4 = 360 mins = 6 hrs

We will add time since Chicago is on West

Hence local time at Chicago = 1200 - 0600 = 0600 hrs = 6 am