A train traveled from city a to city b. For the first 14 hours, it traveled at an average speed of 120 km/h. For the next 10 hours, it traveled at a average speed of 90 km/h. what was the average speed of the whole journey?

Sorry i don’t know what to do

Newtons laws of motion

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.