Question

(11. The speed of an express train is 10 km/h slower than the speed of a superfast train. If the superfast
train takes 30 minutes to cover a distance of 80 km, find the time taken by the express train to cover the distance​

Answer 1

Answer:

8hours

Step-by-step explanation:

distance =80km

speed =10km/hr

time=distance/speed

=>80/10

=8 hours

Ans=>Time taken by the express train to cover 80km at the speed of 10km/hr is 8 hours

Answer 2

Answer:

The express train takes 32.4 mins to cover the distance.

Given:

• For express train,

1. Speed=Speed of super fast train - 10 km/h

• For super fast train,

1. Time=30 mins
2. Distance=80 km

To find:

• The time taken by the express train to cover the distance.

Solution:

For super fast train,

1 min=1/60 hr

>>30 mins=30/60=0.5 hr

Speed=Distance/Time

>> Speed=80/0.5=160 km/hr

But, Speed of express train is 10 km less than Super fast train.

For express train,

>>Speed=160-10=150 km/h

Time=Distance/Speed

Time=80/150=0.54 (approx)

1 hr=60 mins

>> 0.54 hr=60×0.54=32.4 mins

The express train takes 32.4 mins to cover the distance.