In 1969 Neil Armstrong dropped a spanner whilst standing on the surface of the Moon, where acceleration due to gravity is 61 of the Earth's. The time it took to fall to the Moon's surface was:
a. 61 of the time it would have taken on the Earth
b. 61 times the time it would have taken on the Earth
c. 6 times the time it would have taken on the Earth
d. 6 times the time it would have taken on the Earth